.banner{
    width: 100%;
    height: auto;
    display: inline-block;
}
.banner img{
    width: 100%;
}
.ab-top {
    width: 100%;
    height: auto;
    display: inline-block;
    border-bottom: 1px solid #e8e8e8;
}
.abt-left {
    float: left;
    line-height: 65px;
    letter-spacing: 1px;
}
.abt-left img {
    float: left;
    margin-right: 6px;
    margin-top: 24px;
}
.abt-left p {
    float: left;
}
.abt-left p a {
    color: #434343;
}
.abt-nav {
    float: right;
    line-height: 73px;
}
.abt-nav li {
    float: left;
    margin-left: 45px;
}
.abt-nav li:hover{
    border-bottom:1px solid#1e63ac;
}
.abt-nav li a {
    color: #000;
    font-size: 18px;
}
.substance {
    width: 100%;
    height: auto;
    display: inline-block;
    margin-bottom: 50px;
}
.substance h3{
    font-size: 28px;
    line-height: 42px;
    color: #0054a7;
    font-weight: bold;
    text-align: center;
    margin-bottom: 20px;
    margin-top: 34px;
    border-bottom: 1px solid #e6e6e6;
    padding-bottom: 40px;
}
.substance p{
    font-size: 16px;
    line-height: 35px;
    text-indent: 2em;
}
@media screen and (max-width: 1024px) and (min-width: 0px) {
    .abt-nav li {
        float: left;
        margin-left: 8px;
        margin-right: 8px;
    }
    .banner {
        width: 100%;
        height: auto;
        display: inline-block;
        margin-top: 45px;
    }
}