style.css

#scroller {
    margin: 0px auto;
    width: 50%;
    border: 4px solid blue;
    font-size: 33px;
    white-space: nowrap;
    overflow: hidden;
}
#controls {
    margin: 0px auto;
    text-align: center;
    font-size: 33px;
}
input {
    font-size: xx-large;
}