.slideBox img {
    width: 100%;
}

.contentBox ul {
    width: 100%;
    display: flex;
    /* justify-content: space-between; */
    flex-wrap: wrap;
}

.contentBox ul li {
    width: 30%;
    margin-top: 75px;
    cursor: pointer;
    position: relative;
    margin-right: 4%;
}

.contentBox ul li:nth-of-type(3n) {
    margin-right: 0;
}

.contentBox ul li img {
    width: 100%;
    height: 240px;
    margin-bottom: 18px;
}

.contentBox ul li .title {
    height: 138px;
    font-size: 24px;
    font-family: Microsoft YaHei-Regular, Microsoft YaHei;
    font-weight: 400;
    color: #999999;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
    -webkit-line-clamp: 4;
    text-overflow: ellipsis;
}

.contentBox ul li .cover-text {  
    width: 100%;
    font-size: 24px;
    font-family: Microsoft YaHei-Regular, Microsoft YaHei;
    font-weight: 400;
    color: #fff;
    border-radius: 14px;
    box-sizing: border-box;
    padding: 12px 16px;
    background-color: #06c1ae;
    position: absolute;
    left: 0;
    top: 400px;
    z-index: 9999;
    display: none;
}

.contentBox ul li .title:hover{
    color: #000;
}

.contentBox ul li .title:hover .cover-text{
    display: block;
}

@media (min-width: 1200px) and (max-width: 1500px) {
    .contentBox ul li img {
        height: 220px;
    }
    .contentBox ul li .title {
        font-size: 22px;
    }
}

@media (min-width: 900px) and (max-width: 1200px) {
    .contentBox ul li img {
        height: 200px;
    }
    .contentBox ul li .title {
        font-size: 20px;
    }
}

@media (max-width: 900px) {
    .contentBox ul li img {
        height: 160px;
    }
    .contentBox ul li .title {
        font-size: 16px;
    }
}