.sec30{
    position: relative;
    width: 100%;
    height: 50vh;
}
.sec30 img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.sec30 h4{
    position: absolute;
    font-size: 30px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

/* sec31 */
.sec31{
    margin: 0 auto 40px;
    max-width: 1000px;
    padding: 0 20px;
}
.sec31 > h4{
    margin: 40px 0 20px;
    font-size: 30px;
    text-align: center;
}
.sec31 > h5{
    text-align: left;
    font-size: 14px;
    font-weight: initial;
    margin-bottom: 30px;
}
.sec31 .android {
	color: yellow;
}
.sec31 .models h4{
    font-size: 20px;
    border-bottom: 1px solid #fff;
    padding: 5px 20px;
    margin-bottom: 20px;
}
.sec31 .models .model{
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 0 20px;
    box-sizing: border-box;
    margin-bottom: 40px;
}
.sec31 .models .model:after {
    content: "";
    display: block;
    width: 33%;
    height: 0;
}
.sec31 .models .model li{
    width: 33%;
    font-size: 13px;
}
.sec31 .models .operate{
    text-align: center;
    margin-bottom: 20px;
}
.sec31 .models .operate a{
    color: #fff;
    border: 1px solid #fff;
    padding: 10px 20px;
}
.bgleft:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    background:blue;
    width: 100%;
    height: 100%;
    transition: transform .6s cubic-bezier(0.8, 0, 0.2, 1) 0s;
    transform: scale(0, 1);
    transform-origin: right top;
  }

@media screen and (max-width: 1000px){
    .sec31 .models .model:after {
        content: "";
        display: block;
        width: 49%;
        height: 0;
    }
    .sec31 .models .model li{
        width: 49%;
        font-size: 13px;
    }
}

@media screen and (max-width: 700px){
    .sec31 .models .model:after {
        content: "";
        display: block;
        width: 100%;
        height: 0;
    }
    .sec31 .models .model li{
        width: 100%;
        font-size: 13px;
    }
}

@media screen and (max-width: 500px){
    .sec30 h4 {
        font-size: 27px;
    }
    .sec31 > h4 {
        font-size: 25px;
    }
}