.about-bg{
    padding-top: 70px;
    margin-bottom: 50px;
}
.about-bt{
    color: #000;
    font-size: 28px;
    font-weight: bold;
}
.about-diao{
    color: #202020;
    font-size: 15px;
    line-height: 24px;
    margin-top: 30px;
}
.about-con{
    margin-top: 35px;
}
.about-nav {
    width: 340px;
    /*margin-top:30px;*/
}
.about-nav li{
    width: 460px;
    color: #555555;
    font-size: 16px;
}
.about-nav li p{
    color: #c30000;
    font-size: 46px;
    font-family: "times new roman";
    font-weight: bold;
}
.about-nav li span{
    color: #000000;
    font-size: 22px;
    font-weight: bold;
    font-family: "times new roman";
    text-transform: uppercase;
}
.about-nav li:first-child{
    border-bottom: 1px solid #ccc;
    padding-bottom: 45px;
    margin-bottom: 45px;
}
.about-tu {
    width: 740px;
    height: 368px;
    background: url(../images/about-tu.png) no-repeat center;
}