body {
    margin: 0;
}

.images {
    padding: 50px 0;
}

.container {
    margin: 0 auto;
    width: 960px;
    overflow: hidden;
}

.img_item {
    box-sizing: border-box;
    width: 25%;
    float: left;
    padding: 0 3px;
}

.img_item img {
    width: 100%;
}