.common-title{
    font-size: 30px;
    font-weight: bold;
    position: relative;
    text-align: center;
    margin-bottom: 50px;
}
.common-title:before{
    content: '';
    display: block;
    width: 20px;
    height: 3px;
    background-color: #333;
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    margin: 0 auto;
}
.common-title:after{
    position: absolute;
    content: 'Istone Ltd';
    font-size: 48px;
    color: #008CED;
    opacity: 0.1;
    left: 0;
    right: 0;
    margin: 0 auto;
    top: -3px;
}
.banner-section{
    position: relative;
}
.banner-text h1{
    margin-bottom: 30px;
    position: relative;
    margin-top: 0;
}
.banner-text h1:after{
    position: absolute;
    display: block;
    content: '';
    height: 2px;
    background-color: #fff;
    bottom: -15px;
    width: 80px;
}
.banner-text{
    width: 1200px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 115px;
    margin: auto;
    color: #fff;
    z-index: 2;
}
.common-width{
    width: 1200px;
    margin: 0 auto;
}
.main-container {
    width: 1200px;
    margin: 50px auto;
}
.desc-content{
    position: relative;
    text-align: right;
}
.text-content{
    position: absolute;
    left: 0;
    background: #FFFFFF;
    opacity: 0.8;
    box-shadow: 0px 4px 14px 0px rgba(38, 38, 38, 0.1);
    padding: 20px;
    font-size: 14px;
    color: #666;
    width: 710px;
    text-align: left;
    line-height: 28px;
    height: 292px;
    top: 0;
    bottom: 0;
    margin: auto 0;
}
.text-content > div{
    text-indent: 2rem;
}
.adv-content{
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
}
.adv-content > div{
    flex: 1;
    box-shadow: 0px 4px 14px 0px rgba(38, 38, 38, 0.1);
    text-align: center;
    color: #333;
}
.adv-content img{
    width: 100%;
}
.adv-content > div:nth-child(2){
    margin: 0 30px;
}
@media (max-width: 1200px) {
    .common-width{
        width: 100%;
    }
    .banner-text{
        width: 50%;
    }
    .main-container{
        width: 100%;
    }
    .desc-content img{
        max-width: 100%;
    }
}
@media (max-width: 768px) {
    .banner-text{
        display: none;
    }
    .text-content{
        width: 90%;
        position: unset;
        margin: 0 auto;
        color: #333;
        height: auto;
    }
    .desc-content img{
        display: none;
    }
    .adv-content > div:nth-child(2){
        margin: 0 15px;
    }
    .adv-content{
        margin-top: 20px;
    }
    .common-title{
        font-size: 20px;
        margin-bottom: 30px;
    }
    .common-title:after{
        font-size: 32px;
    }
}
@media (max-width: 440px) {
    .adv-content{
        display: block;
        width: 90%;
        margin: 0 auto;
    }
    .adv-content > div:nth-child(2){
        margin: 15px 0;
    }
    .adv-content > div{
        padding-bottom: 1px;
    }
}