play.css

body {
    background-color: tan;
    margin: 0;
    font-family: "Montserrat", "Avenir";
}

.square {
    width: 30%;
    /*background: purple;*/
    /*padding-bottom: 30%;*/
    float: left;
    margin: 1.66%;
    border-radius: 15%;
    transition: background 0.6s;
    -webkit-transition: background 0.6s;
    -moz-transition: background 0.6s;
}

img:hover {
    opacity: .4;
}

#container {
    margin: 20px auto;
    max-width: 600px;
}

h1 {
    text-align: center;
    line-height: 1.1;
    font-weight: normal;
    font-size: 2.5em;
    font-family: "Lucida Bright", Georgia, serif;
    color: white;
    background: #331a00;
    margin: 0;
    /*text-transform: uppercase;*/
    padding: 20px 0 5px 0;
}

h2 {
    text-align: center;
    /*line-height: 1.1;*/
    font-weight: normal;
    color: white;
    background: #331a00;
    margin: 0;
    padding: 20px 0;
}

#answer {
    font-style: italic;
    letter-spacing: 1px;
    margin-left: 5px;
    color: #ebef70;
}

#message {
    display: inline-block;
    width: 20%;
    font-size: 1.3em;
}

#stripe {
    background: white;
    height: 30px;
    text-align: center;
}

.selected {
    color: white;
    background: #331a00;
}

button {
    border: none;
    background: none;
    text-transform: uppercase;
    height: 100%;
    font-weight: 700;
    color: #331a00;
    letter-spacing: 1px;
    font-size: inherit;
    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    outline: none;
}

button:hover {
    color: white;
    background: #331a00;
}

a {
    color: #331a00;
    text-decoration: none;
}

a:hover {
    color: blue;
}

.photoCredits {
    font-size: 1.1em;
    /*font-weight: bold;*/
}