.case-show {
    text-align: center;
}

.case-title {
    font-size: 38px;
    line-height: 38px;
    color: #333;
}

.case-explain {
    margin-top: 50px;
    font-size: 26px;
    line-height: 26px;
    color: #666;
}

.case-list {
    margin: 100px auto;
    display: flex;
    flex-wrap: wrap;
    width: 1200px;
}