.case .case_roll {
    overflow: hidden;
}

.case .case_roll ul li {
    margin-bottom: 50px;
}

@media screen and (max-width: 767px) {
    .product_right {
        margin-bottom: 0;
    }
    .case .case_roll ul li {
        margin-bottom: 0;
    }
    .case .case_roll ul li {
        margin-bottom: 10px;
    }
    .case_text span {
        line-height: 30px;
        text-align: center;
    }
}

@media (min-width: 768px)and (max-width:1024px) {
    .product_right {
        margin-bottom: 0;
    }
    .case .case_roll ul li {
        margin-bottom: 0;
        width: 48%;
        float: left;
        margin: 0 1%;
    }
    .case_roll ul li .case_text {
        background: none;
    }
    .case_roll li:hover .case_text {
        background: none;
    }
}