index.css

body{
    background-color: #232323;
    margin:0;
    font-family:Verdana, Geneva, Tahoma, sans-serif;
}
.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
}
#container{
    max-width:600px;
    margin:20px auto;
}
h1{
    color:white;
    text-align: center;
    background: steelblue;
    margin:0;
    font-weight: normal;
    text-transform: uppercase;
    line-height: 1.1;
    padding:20px 0;
}
#colorDisplay{
    font-size: 200%;
}
#message{
    display: inline-block;
    width:20%;
}

#stripe{
    background: white;
    height:30px;
    text-align: center;
}
.selected{
    color:white;
    background: steelblue;
}
button{
    border:none;
    background: none;
    text-transform: uppercase;
    height:100%;
    font-weight: 700;
    color:steelblue;
    letter-spacing: 1px;
    font-size: inherit;
    transition: all 0.3s;
    -webkit-transition:all 0.3s;
    -moz-transition-all:all 0.3s;
    outline: none;
}
button:hover{
    color:white;
    background: steelblue;
}