.visual_area {
    margin-bottom: 100px;
}
.board h3 {
    font-size: 2.2em;
    text-align: center;
    font-weight: 700;
    margin-bottom: 50px;
}
.content {
    width: 1200px;
    margin: 0 auto;
}
@media screen and (max-width:1024px) {
    .content {
        width: 96%;
    }
}