style.css

body {
  background-color:#232323;
  margin:0;
  font-family:"Montserrat","Avenir";

}

h1{
  color:white;
  text-align: center;
  line-height: 1.1;
  background-color: steelblue;
  margin:0;
  font-weight: normal;
  text-transform: uppercase;
  padding: 20px 0;
}

#colorDisplay {
  font-size:200%;
}

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

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

#message {
  display:inline-block;
  width:20%;
  font-family:inherit;

}

.selected {
  background-color: steelblue;
  color:white;
}

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

button:hover {
  background-color: steelblue;
  color:white;
}