.bases-bg{
    background: url('../images/bases_bg.jpg') no-repeat center 0;
    background-size: cover;
}
.bases ul li {
    float: left;
    width: 33.3%;
    padding: 5px;
}

.bases ul li a {
    display: block; 
    padding: 8px 8px 0;
    background: #fff no-repeat right bottom;
}

.bases ul li img {
    width: 100%;
}

.bases ul li p {
    font: 400 16px/30px '微软雅黑';
    color: #000000;
    opacity: 0;
}

.bases ul li a:hover {
    padding: 0 8px 8px;
    background-image: url('../images/part3_li_bg.png');
}

.bases ul li a:hover p {
    opacity: 1;
}