.banner img {
    width: 100%;
    /* height: 350px; */
}

.cases-content {
    width: 100%;
}

.content-wrap {
    width: 1200px;
    margin: 50px auto;
}

.content-item h2 {
    padding: 10px 0;
    font-weight: 400;
}

.content-img img {
    width: 390px;
    height: 290px;
    padding: 5px;
}

.slow-traffic,.smart-charging{
    padding-top: 50px;
}