body {
    background: #F5F2F2
}

.public_nav {
    min-width: 960px
}

.public_nav .list .item:not(:first-child)::after {
    display: none
}

.theory {
    padding: 90px 0 130px 0
}

.theory .wrap {
    width: 1440px;
    margin: auto
}

.theory .wrap .big {
    height: 380px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #C8161D
}

.theory .wrap .big .img {
    width: 710px;
    height: 440px;
    position: relative;
    left: 10px;
    /* z-index: 5 */
    z-index: 1
}

.theory .wrap .big .img .swiper1 {
    width: 100%;
    height: 100%;
    /* height: 430px; */
}

.theory .wrap .big .img .swiper1 .swiper-slide {
    opacity: 0 !important;
    transition: 1s
}

.theory .wrap .big .img .swiper1 .swiper-slide.swiper-slide-active {
    opacity: 1 !important
}

.theory .wrap .big .img .swiper1 .swiper-slide img {
    width: 100%;
    height: 100%;
    transition: 1s
}

.theory .wrap .big .img .swiper1 .swiper-slide img:hover {
    transform: scale(1.05)
}

.theory .wrap .big .r {
    width: 720px;
    height: 100%;
    padding: 50px;
    position: relative;
    z-index: 1
}

.theory .wrap .big .r:after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background: linear-gradient(90deg, #C8161D, #EBA011)
}

.theory .wrap .big .r .r_cut {
    position: relative
}

.theory .wrap .big .r .r_cut .matter {
    width: 100%;
    pointer-events: none;
    position: relative
}

.theory .wrap .big .r .r_cut .matter:not(:first-child) {
    position: absolute;
    top: 0;
    left: 0
}

.theory .wrap .big .r .r_cut .matter.on {
    pointer-events: auto
}

.theory .wrap .big .r .r_cut .matter.on h1 {
    opacity: 1;
    transform: translateY(0);
    transition-delay: .3s
}

.theory .wrap .big .r .r_cut .matter.on .text {
    opacity: 1;
    transform: translateY(0);
    transition-delay: .5s
}

.theory .wrap .big .r .r_cut .matter h1 {
    font-weight: bold;
    font-size: 20px;
    color: #FFFFFF;
    line-height: 30px;
    padding: 0 0 28px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    margin: 0 0 33px;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity .3s, transform .6s .4s;
    height: 89px;
    -webkit-line-clamp: 2;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden
}

.theory .wrap .big .r .r_cut .matter .text {
    width: 608px;
    font-weight: 400;
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 32px;
    max-width: 100%;
    height: 96px;
    transform: translateY(10px);
    transition: opacity .3s, transform .6s .4s;
    opacity: 0;
    -webkit-line-clamp: 3;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden
}

.theory .wrap .big .r .paging {
    display: flex;
    align-items: center;
    margin: 55px 0 0 0
}

.theory .wrap .big .r .paging div {
    width: 8px;
    height: 8px;
    background: #FFFFFF;
    border-radius: 50%;
    transition: .3s ease;
    cursor: pointer
}

.theory .wrap .big .r .paging div.on {
    width: 31px;
    border-radius: 4px
}

.theory .wrap .big .r .paging div:not(:last-child) {
    margin: 0 14px 0 0
}

.theory .wrap .grid {
    display: flex;
    flex-wrap: wrap;
    grid-gap: 50px 30px;
    margin: 90px 0 98px 0
}

.theory .wrap .grid .item {
    width: 460px;
    display: block;
    background: #FFFFFF;
    position: relative
}

.theory .wrap .grid .item:hover .img img {
    transform: scale(1.05)
}

.theory .wrap .grid .item:hover .text h1 {
    color: #C8161D
}

.theory .wrap .grid .item:hover:after {
    transform: scaleX(1)
}

.theory .wrap .grid .item:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: #C8161D;
    transform: scaleX(0);
    transition: .6s ease;
    transform-origin: left
}

.theory .wrap .grid .item .img {
    width: 100%;
    height: 280px;
    overflow: hidden;
    position: relative
}

.theory .wrap .grid .item .img img {
    width: 100%;
    height: 100%;
    transition: 1s
}

.theory .wrap .grid .item .text {
    padding: 0 32px 54px 32px;
    margin-top: -38px;
    position: relative;
    /* z-index: 56 */
    z-index: 1;
}

.theory .wrap .grid .item .text .time {
    width: 78px;
    height: 78px;
    background: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 0 24px
}

.theory .wrap .grid .item .text .time div {
    width: 70px;
    height: 70px;
    background: linear-gradient(45deg, #C8161D, #EBA011);
    padding: 8px 0;
    text-align: center
}

.theory .wrap .grid .item .text .time div span {
    font-weight: bold;
    font-size: 34px;
    color: #FFFFFF;
    margin: 0 0 7px;
    display: block;
    line-height: 1;
}

.theory .wrap .grid .item .text .time div p {
    font-weight: 400;
    font-size: 12px;
    color: #FFFFFF
}

.theory .wrap .grid .item .text h1 {
    font-weight: bold;
    font-size: 18px;
    color: #111111;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0 0 21px;
    transition: .3s ease
}

.theory .wrap .grid .item .text>p {
    font-weight: 400;
    font-size: 14px;
    color: #444444;
    line-height: 24px;
    -webkit-line-clamp: 2;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden
}

.theoryInfo {
    padding: 155px 0 100px 0
}

.theoryInfo .wrap {
    width: 1440px;
    margin: auto
}

.theoryInfo .wrap .crumbs a {
    color: #999999
}

.theoryInfo .wrap .crumbs a.active {
    color: #333333
}

.theoryInfo .wrap .flex {
    margin: 76px 0 0 0;
    display: flex;
    justify-content: space-between
}

.theoryInfo .wrap .flex .content {
    width: 960px
}
.theoryInfo .wrap .flex .content .headline .l{
    flex: 1;
}
.theoryInfo .wrap .flex .content .headline {
    display: flex;
    justify-content: space-between;
    padding: 0 0 40px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    margin: 0 0 50px
}

.theoryInfo .wrap .flex .content .headline .l h1 {
    font-weight: bold;
    font-size: 30px;
    line-height: 1.2;
    color: #800000;
    margin: 0 0 25px
}

.theoryInfo .wrap .flex .content .headline .l p {
    font-weight: 300;
    font-size: 14px;
    color: #888888
}

.theoryInfo .wrap .flex .content .headline .r {
    display: flex;
    align-items: center;
    height: fit-content
}

.theoryInfo .wrap .flex .content .headline .r p {
    font-weight: 300;
    font-size: 18px;
    color: #999999
}

.theoryInfo .wrap .flex .content .headline .r .img {
    width: 28px;
    position: relative;
    margin: 0 0 0 31px
}

.theoryInfo .wrap .flex .content .headline .r .img:after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: -15px;
    width: 1px;
    height: 17px;
    background: #E6E6E6
}

.theoryInfo .wrap .flex .content .text p {
    font-weight: 400;
    font-size: 20px;
    color: #333333;
    line-height: 40px
}

.theoryInfo .wrap .flex .content .link {
    margin: 105px 0 0 0
}

.theoryInfo .wrap .flex .content .link a {
    font-weight: 200;
    font-size: 18px;
    color: #666666;
    display: block;
    transition: .3s ease
}

.theoryInfo .wrap .flex .content .link a:not(:last-child) {
    margin: 0 0 29px
}

.theoryInfo .wrap .flex .content .link a b {
    color: #111111;
    transition: .3s ease
}

.theoryInfo .wrap .flex .content .link a:hover {
    color: #9C0C18
}

.theoryInfo .wrap .flex .content .link a:hover b {
    color: #9C0C18
}

.theoryInfo .wrap .flex .rr {
    width: 380px
}

.theoryInfo .wrap .flex .rr .red {
    height: 71px;
    background: #800000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 24px;
    color: #FFFFFF;
    margin: 0 0 25px
}

.theoryInfo .wrap .flex .rr .matter .item {
    width: 100%;
    display: block;
    background: #FFFFFF;
    position: relative;
    margin: 0 0 20px
}

.theoryInfo .wrap .flex .rr .matter .item:hover .img img {
    transform: scale(1.05)
}

.theoryInfo .wrap .flex .rr .matter .item:hover .text h1 {
    color: #C8161D
}

.theoryInfo .wrap .flex .rr .matter .item:hover:after {
    transform: scaleX(1)
}

.theoryInfo .wrap .flex .rr .matter .item:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: #C8161D;
    transform: scaleX(0);
    transition: .6s ease;
    transform-origin: left
}

.theoryInfo .wrap .flex .rr .matter .item .img {
    width: 100%;
    overflow: hidden;
    position: relative;
    display: none;
}

.theoryInfo .wrap .flex .rr .matter .item .img img {
    width: 100%;
    height: 100%;
    transition: 1s
}

.theoryInfo .wrap .flex .rr .matter .item .text {
    padding: 30px 32px 54px 32px;
    /* margin-top: -38px; */
    position: relative;
    z-index: 56
}

.theoryInfo .wrap .flex .rr .matter .item .text .time {
    width: 78px;
    height: 78px;
    background: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 0 24px
}

.theoryInfo .wrap .flex .rr .matter .item .text .time div {
    width: 70px;
    height: 70px;
    background: linear-gradient(45deg, #C8161D, #EBA011);
    padding: 8px 0;
    text-align: center
}

.theoryInfo .wrap .flex .rr .matter .item .text .time div span {
    font-weight: bold;
    font-size: 34px;
    line-height: 1;
    color: #FFFFFF;
    margin: 0 0 7px;
    display: block
}

.theoryInfo .wrap .flex .rr .matter .item .text .time div p {
    font-weight: 400;
    font-size: 12px;
    color: #FFFFFF
}

.theoryInfo .wrap .flex .rr .matter .item .text h1 {
    font-weight: bold;
    font-size: 18px;
    color: #111111;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0 0 21px;
    transition: .3s ease
}

.theoryInfo .wrap .flex .rr .matter .item .text>p {
    font-weight: 400;
    font-size: 14px;
    color: #444444;
    line-height: 24px;
    -webkit-line-clamp: 2;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden
}
.theoryInfo .wrap .flex .content .text p img{
    height: auto;
}

@media screen and (max-width: 1920px) {
    .public_nav {
        min-width: 50vw;
      }
      .theory {
        padding: 4.6875vw 0 6.77083333vw 0;
      }
      .theory .wrap {
        width: 75vw;
      }
      .theory .wrap .big {
        height: 19.79166667vw;
      }
      .theory .wrap .big .img {
        width: 36.97916667vw;
        height: 22.91666667vw;
        left: 0.52083333vw;
      }
      .theory .wrap .big .r {
        width: 37.5vw;
        padding: 2.60416667vw;
      }
      .theory .wrap .big .r .r_cut .matter h1 {
        font-size: 1.04166667vw;
        line-height: 1.5625vw;
        padding: 0 0 1.45833333vw;
        border-bottom: 0.05208333vw solid rgba(255, 255, 255, 0.3);
        margin: 0 0 1.71875vw;
        height: 4.63541667vw;
        transform: translateY(0.52083333vw);
      }
      .theory .wrap .big .r .r_cut .matter .text {
        width: 31.66666667vw;
        font-size: 0.83333333vw;
        line-height: 1.66666667vw;
        height: 5vw;
        transform: translateY(0.52083333vw);
      }
      .theory .wrap .big .r .paging {
        margin: 2.86458333vw 0 0 0;
      }
      .theory .wrap .big .r .paging div {
        width: 0.41666667vw;
        height: 0.41666667vw;
      }
      .theory .wrap .big .r .paging div.on {
        width: 1.61458333vw;
        border-radius: 0.20833333vw;
      }
      .theory .wrap .big .r .paging div:not(:last-child) {
        margin: 0 0.72916667vw 0 0;
      }
      .theory .wrap .grid {
        grid-gap: 2.60416667vw 1.5625vw;
        margin: 4.6875vw 0 5.10416667vw 0;
      }
    .theory .wrap .grid .item{
        width: 23.958333333333336vw;
    }
      .theory .wrap .grid .item:after {
        height: 0.15625vw;
      }
      .theory .wrap .grid .item .img {
        height: 14.58333333vw;
      }
      .theory .wrap .grid .item .text {
        padding: 0 1.66666667vw 2.8125vw 1.66666667vw;
        margin-top: -1.97916667vw;
      }
      .theory .wrap .grid .item .text .time {
        width: 4.0625vw;
        height: 4.0625vw;
        margin: 0 0 1.25vw;
      }
      .theory .wrap .grid .item .text .time div {
        width: 3.64583333vw;
        height: 3.64583333vw;
        padding: 0.41666667vw 0;
      }
      .theory .wrap .grid .item .text .time div span {
        font-size: 1.77083333vw;
        margin: 0 0 0.36458333vw;
      }
      .theory .wrap .grid .item .text .time div p {
        font-size: 0.625vw;
      }
      .theory .wrap .grid .item .text h1 {
        font-size: 0.9375vw;
        margin: 0 0 1.09375vw;
      }
      .theory .wrap .grid .item .text > p {
        font-size: 0.72916667vw;
        line-height: 1.25vw;
      }
      .theoryInfo {
        padding: 8.07291667vw 0 5.20833333vw 0;
      }
      .theoryInfo .wrap {
        width: 75vw;
      }
      .theoryInfo .wrap .flex {
        margin: 3.95833333vw 0 0 0;
      }
      .theoryInfo .wrap .flex .content {
        width: 50vw;
      }
      .theoryInfo .wrap .flex .content .headline {
        padding: 0 0 2.08333333vw;
        margin: 0 0 2.60416667vw;
      }
      .theoryInfo .wrap .flex .content .headline .l h1 {
        font-size: 1.5625vw;
        margin: 0 0 1.30208333vw;
      }
      .theoryInfo .wrap .flex .content .headline .l p {
        font-size: 0.72916667vw;
      }
      .theoryInfo .wrap .flex .content .headline .r p {
        font-size: 0.9375vw;
      }
      .theoryInfo .wrap .flex .content .headline .r .img {
        width: 1.45833333vw;
        margin: 0 0 0 1.61458333vw;
      }
      .theoryInfo .wrap .flex .content .headline .r .img:after {
        left: -0.78125vw;
        width: 0.05208333vw;
        height: 0.88541667vw;
      }
      .theoryInfo .wrap .flex .content .text p {
        font-size: 1.0416666vw;
        line-height: 2.083333333vw;
      }
      .theoryInfo .wrap .flex .content .link {
        margin: 5.46875vw 0 0 0;
      }
      .theoryInfo .wrap .flex .content .link a {
        font-size: 0.9375vw;
      }
      .theoryInfo .wrap .flex .content .link a:not(:last-child) {
        margin: 0 0 1.51041667vw;
      }
      .theoryInfo .wrap .flex .rr {
        width: 19.79166667vw;
      }
      .theoryInfo .wrap .flex .rr .red {
        height: 3.69791667vw;
        font-size: 1.25vw;
        margin: 0 0 1.30208333vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item {
        margin: 0 0 1.04166667vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item:after {
        height: 0.15625vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text {
        padding: 1.5625vw 1.66666667vw 2.8125vw 1.66666667vw;
        /* margin-top: -1.97916667vw; */
      }
      .theoryInfo .wrap .flex .rr .matter .item .text .time {
        width: 4.0625vw;
        height: 4.0625vw;
        margin: 0 0 1.25vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text .time div {
        width: 3.64583333vw;
        height: 3.64583333vw;
        padding: 0.41666667vw 0;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text .time div span {
        font-size: 1.77083333vw;
        margin: 0 0 0.36458333vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text .time div p {
        font-size: 0.625vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text h1 {
        font-size: 0.9375vw;
        margin: 0 0 1.09375vw;
      }
      .theoryInfo .wrap .flex .rr .matter .item .text > p {
        font-size: 0.72916667vw;
        line-height: 1.25vw;
      }
    /* .theory .wrap .big .img .swiper1 {
        height: 22.39583333vw;
    }   */
}
@media screen and (max-width: 1024px) {
    .theory .wrap{
        width: 90%;
    }
    .theory .wrap .big .img {
        width: 50%;
        height: 100%;
        left: 0;
    }
    .theory .wrap .big{
        height: auto;
    }
    .theory .wrap .big .r{
        flex: 1;
        padding: 20px;
    }
    .theory .wrap .big .r .r_cut .matter h1{
        font-size: 16px;
        line-height: 1.6;
    }
    .theory .wrap .big .r .r_cut .matter .text{
        font-size: 14px;
        width: 100%;
        line-height: 1.6;
    }
    .theory .wrap .big .r .paging div.on{
        width: 24px;
    }
    .theory .wrap .grid{
        margin: 30px auto;
    }
    .theory .wrap .grid .item .text h1{
        font-size: 16px;
        line-height: 1.6;
    }
    .theory .wrap .grid .item .text > p{
        font-size: 14px;
        line-height: 1.6;
    }
    .theory .wrap .grid .item .img {
        /* height: 24.4140625vw; */
        height: auto;
    }
    .theory .wrap .grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        /* grid-template-columns: repeat(2, 1fr);  */
    }
    .theory .wrap .grid .item{
        width: 49%;
    }

    .theory .wrap .grid .item .text .time {
        width: 60px;
        height: 60px;
        margin-bottom: 10px;
    }
    .theory .wrap .grid .item .text .time div {
        width: 50px;
        height: 50px;
        padding: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    .theory .wrap .grid .item .text .time div p {
        font-size: 10px;
    }
    .theory .wrap .big .r .r_cut .matter .text{
        height: auto;
    }
    .theory .wrap .big .r .r_cut .matter h1{
        height: 56px;
    }
    .theory .wrap .grid .item .text .time div span {
        font-size: 20px;
    }
    .theory .wrap .grid .item .text{
        margin-top: -30px;
    }
    .theory .wrap .grid{
        grid-gap: 20px 0;
    }
    .theory .wrap .grid .item:after{
        height: 2px;
    }
    .theoryInfo .wrap .flex .content .headline .l h1{
        font-size: 18px;
        line-height: 1.6;
    }
    .theoryInfo .wrap .flex .content .headline .l p{
        font-size: 12px;
    }
    .theoryInfo .wrap .flex .content .headline .l{
        margin-bottom: 10px;
    }
    .theoryInfo .wrap .flex .content .headline .r p {
        font-size: 12px;
    }
    .theoryInfo .wrap .flex .content .headline{
        flex-direction: column;
    }

    .theoryInfo .wrap .flex .rr .matter .item .text .time {
        width: 60px;
        height: 60px;
        margin-bottom: 10px;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text .time div{
        width: 50px;
        height: 50px;
        padding: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text .time div p {
        font-size: 10px;
    }
    .theoryInfo .wrap{
        width: 90%;
    }
    .theoryInfo .wrap .flex .rr {
        width: 100%;
        margin-top: 30px;
    }
    .theoryInfo .wrap .flex .content{
        width: 100%;
    }
    .theoryInfo .wrap .flex .content .text p{
        font-size: 14px;
        line-height: 1.6;
    }
    .news_header~div .theoryInfo .wrap .flex .content .text p>span>span,
    .news_header~div .theoryInfo .wrap .flex .content .text p>span{
        font-size: 14px !important;
        line-height: 1.6;
    }
    .theoryInfo .wrap .flex .content .text p img{
        margin: 10px 0;
        height: auto !important;
    }
    .theoryInfo .wrap .flex .content .link a{
        font-size: 12px;
        line-height: 1.6;
    }
    .theoryInfo .wrap .flex .content .link a:not(:last-child){
        margin-bottom: 20px;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text h1{
        font-size: 14px;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text > p{
        font-size: 12px;
        line-height: 1.6;
    }
    .theoryInfo .wrap .flex .rr .red {
        height: 40px;
        font-size: 16px;
    }
    .theoryInfo .wrap .flex{
        flex-direction: column;
    }
    .theoryInfo .wrap .flex .rr .matter .item{
        width: 49%;
    }
    .theoryInfo .wrap .flex .rr .matter{
        display: flex;
        grid-gap: 10px 0;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    .theoryInfo .wrap .flex .rr .red{
        margin-bottom: 20px;
    }
    .theoryInfo .wrap .flex .content .headline .r .img{
        width: 20px;
        margin-left: 20px;
    }
    .theoryInfo .wrap .flex .content .headline .r .img:after{
        width: 1px;
        left: -10px;
        height: 20px;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text .time div span{
        font-size: 18px;
    }
    .theoryInfo .wrap .flex .rr .matter .item .text{
        padding:20px;
    }
    .theoryInfo{
        /* padding: 40px 0; */
        padding: 100px 0;
    }
    .theory .wrap .big{
        height: 27.34375vw;
    }


    .theoryInfo .wrap .flex{
        margin-top: 30px;
    }
    .theoryInfo .wrap .flex .content .headline .l h1{
        margin-bottom: 10px;
    }
    .theoryInfo .wrap .flex .content .headline .l{
        margin-bottom: 20px;
    }
    .theoryInfo .wrap .flex .content .headline{
        padding-bottom: 10px;
        margin-bottom: 20px;
    }
    .seize{
        display: none;
    }

    .theory .wrap .big .r .paging div {
        width: 5px;
        height: 5px;
    }
    .theory .wrap .big .r .paging div.on{
        border-radius: 5px;
    }
    .theory .wrap .big .r .paging{
        margin-top: 10px;
    }
    .theory .wrap .big .r .r_cut .matter h1{
        padding-bottom: 10px;
        margin-bottom: 10px;
    }
}

@media screen and (max-width: 767px) {
    .theory{
        padding-top: 40px;
        padding-bottom: 40px;
    }

    .theory .wrap .big{
        flex-direction: column;
    }
    .theory .wrap .big .img{
        width: 100%;
        height: 52.1512385919vw;
    }
    .theory .wrap .big .r{
        width: 100%;
        padding: 20px;
    }
    .theory .wrap .grid .item{
        width: 100%;
    }
    .theory .wrap .grid .item .text{
        padding: 0 20px 20px;
    }
    .theoryInfo .wrap .flex .content .text p {
        font-size: 12px;
    }
    .theoryInfo .wrap .flex .rr .matter .item{
        width: 100%;
    }
    .theoryInfo .wrap .flex .content .headline .r .img {
        width: 16px;
        margin-left: 16px;
    }
    .theory .wrap .big{
        height: auto;
    }
}