.bg_r {
    background-color: #FF6262;
}
.bg_g {
    background-color: #94FF94;
}
.bg_b {
    background-color: #3BB8FF;
}
.bg_y {
    background-color: #FFFF79;
}
.scrollx {
    border-bottom: 3px solid #009;
    overflow-x: scroll;
    margin-bottom: 1em;
}