main.css

body{
    background: #232323;
    font-family: "Roboto Slab";
    margin: 0;
}

h1{
    color: whitesmoke;
    background: #1b646d;
    margin: 0 ;
    padding: 20px 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    font-weight: 100;
    line-height: 1.1;
}

#colorDisplay{
    font-size: 200%;
}

span{
    color: whitesmoke;
}

#stripe{
    background: whitesmoke;
    height: 30px;
    text-align: center;
    text-transform: uppercase;
}

#message{
    color: #232323;
    display: inline-block;
    width: 20%;

}

button{
    border: none;
    background: none;
    color: #1b646d;
    block-size: 100%;
    height: 100%;
    font-size: 17px;
    font-weight: 700;
    font-family: inherit;
    text-transform: inherit;
    letter-spacing: 1px;
    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
}

button:hover{
    background: #1b646d;
    color: whitesmoke;
}

.selected{
    background: #1b646d;
    color: whitesmoke;
    
}

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

.square{
    background: purple;
    width: 30%;
    padding-bottom: 30%;
    float: left;
    margin: 1.66%;
    border-radius: 25% / 50%; 
    transition: all 0.6s;
    -webkit-transition: all 0.6s;
    -moz-transition: all 0.6s;
}