/* Button design */
#b1font, #b2bgcolor, #b3slides  { 
    padding: 10px;
    font-size: large;
}
#b1font:hover, #b2bgcolor:hover, #b3slides:hover{ /* What happens when you hover over the buttons */
    color: darkgreen;
    background-color: black;
    border: 2px solid purple;
}