body {
    background-image: url("lebron-james-lakers.jpg");
    background-size: cover;
    color: white;
}

.square {
    width: 150px;
    height: 150px;
    border: 3px solid black;
    font-size: 0;
    display: inline-block;
}

#s1 {
    background-color: green;
    opacity: .5;
}

#s2 {
    background-color: red;
    opacity: .5;
}

#s3 {
    background-color: yellow;
    opacity: .5;
}

#s4 {
    background-color: blue;
    opacity: .5;
}

#controls {
    display: inline-block;
    vertical-align: top;
    margin-bottom: 30px;
    text-align: center;
}

#test {
    display: inline-block;
}

#level {
    font-size: 30px;
}

#winner {
    font-size: 50px;
}