.shelf {
    display: block;
    z-index: 9;
    content: url("https://i.imgur.com/8gP8beF.png");
    position: relative;
    width: 941px;
    height: 175px;
    margin-left: auto;
    margin-right: auto;
}

.stuffonshelf {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    position: relative;
    z-index: 10;
    margin-bottom: -80px; /* This is what actually puts the stuff ON the shelf instead of hovering above it */
    width: 770px;
    margin-left: auto;
    margin-right: auto;
}