.b4-wen h2 {
    width: 100%;
    text-align: center;
    padding-top: 45px;
    padding-bottom: 45px;
    font-size: 36px;
    color: #333333;
}
.b4-wen .down-lisy {
    max-width: 1200px;
    margin: auto;
    border-top: 2px solid #2C74CE;
}
.b4-wen .down-lisy li {
    float: left;
    width: calc((100% - 40px)/2);
    height: 60px;
    line-height: 60px;
    font-size: 16px;
    color: #333333;
    border-bottom: 1px solid #EBECED;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.b4-wen li .down img {
    float: left;
    margin: 15px 10px 0 0;
    width: 27px;
    height: 27px;
}