section {
    width: 100%;
    margin: 0;
    border: 5px lightgrey solid;
}
section h2 {
    margin: 1% 0;
}
nav {
    border-top: 0;
    width: 100%;
    display: flex;
    justify-content: space-evenly;
    flex-wrap: nowrap;
    overflow-x: scroll;
    background-image: url(bg_check.png);
}
nav .item {
    display: block;
    width: 280px;
    max-width: 50%;
    text-align: center;
}
nav img {
    max-width: 75%;
}