*{
    box-sizing: border-box;
}
.about-us{
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
    margin: 40px;
}
.about-us-left{
    width: 16%;
    float: left;
}
.about-us-right{
    width: 80%;
    margin-left: 4%;
    float: left;
}
.about-us-left-title{
    width: 100%;
    height: 80px;
    line-height: 80px;
    font-size: 18px;
    font-weight: bold;
    background: #343a40;
    color: #fff;
    text-align: center;
}
.about-us-left-item{
    padding-left: 10px;
    line-height: 40px;
    margin: 3px 0;
    position: relative;
    background: #ebebeb;
}
.sel{
    background: #0c3547;
    color: #fff;
}
.about-us-left-item span{
    display: none;
}
.about-us-left .sel span{
    display: block;
    width: 20px;
    height: 20px;
    position: absolute;
    right: 20px;
    top: 10px;
}
.icon_play{
    width: 100%;
    vertical-align: top;
}
.article{
    width: 100%;
    display: none;
}
.article1{
    line-height: 24px;
    display: block;
}
.about-us-right-title{
    width: 100%;
    height: 40px;
    line-height: 40px;
    padding-left: 20px;
    margin-bottom: 40px;
    border: 1px solid #cccccc;
    font-size: 18px;
}
.article img{
    display: block;
    width: auto;
    margin: auto;
}