* {
    margin: 0;
    padding: 0;
    user-select: none;
}
.main {
    position: relative;
    margin: 0 auto;
    width: 100%;
}
.bg {
    width: 100%;
}

.content {
    position: absolute;
    left: 21.5%;
    width: 55%;
    display: flex;
    flex-wrap: wrap;
}
.content a {
    width: 25%;
}
.content img {
    width: 100%;
}
.sc_content {
    top: 19.5%;
}
.zc_content {
    top: 67%;
}