body {
    font-family:Verdana,sans-serif;
}

.changedisplay {
    width:65%;
    margin:auto;
    text-align:center;
    background-image:linear-gradient(to right, green,yellow,red);
    font-size:3em;
    font-weight:bolder;
    color:#000000;
}

#buttonbox {
    height:100px;
    width:100px;
    position:absolute;
    background-color:#2936ca;
    cursor:pointer;
}

.inverse {
    background-color:#000000;
    color:#ffffff;
}