.about_list{
    width: 1200px;
    margin: 0 auto;
    margin-top: 30px;
}
.about_list img {
    border: 1px #ccc solid;
    width: 100%;
    height: 250px;
}

.about_list .tit {
    text-align: center;
    margin-bottom: 20px;
    color: #666;
    overflow: hidden;
    font-size: 16px;
    margin-top: 15px;
}
.rongyu{
    width: 23%;
    padding: 12px;
    float: left;
    height: 300px;
}

.rongyu a {
    width: 100%;
    display: block;
}