body {
    background-color: red;
}

.center {
    text-align: center;
    display: block;
    margin: 0 auto;
}

#change {
    max-width: 65%;
    height: auto;
}

button {
    position: absolute;
    
    padding: 25px 80px;
    font-size: 250%;
    box-sizing: border-box;
    
}

.left {
    left: 150px;
}
.middle {
    left: 50%;
    transform: translate(-50%);
}
.right {
    right: 150px;
}

#instructions {
    font-size: 150%;
}

#selected {
    font-size: 120%;
}