body{
  margin:0;
  text-align:center;
  font-family: Verdana;
  background:#f5f5f5;
}
h1 {
  text-align:center;
}
.container {
  width:90%;
  margin:0 auto;
}
input[type="radio"] {
    display:none;
}
label {
  width:23%;
  float:left;
  text-align:center;
  background:#ffffff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  color:#222222;
  padding:0.5%;
  margin:0.5%;
  margin-bottom:30px;
  cursor:pointer;
}
input[type="radio"][id="blue"]:checked + label {
  background:#6666ff;
}
input[type="radio"][id="blue"]:checked ~ .red, input[type="radio"][id="blue"]:checked ~ .green {
  width:0;
  height:0;
  padding:0;
  margin:0;
  opacity:0;
}
input[type="radio"][id="red"]:checked + label {
  background:#ff4466;
}
input[type="radio"][id="red"]:checked ~ .blue, input[type="radio"][id="red"]:checked ~ .green {
  width:0;
  height:0;
  padding:0;
  margin:0;
  opacity:0;
}
input[type="radio"][id="green"]:checked + label {
  background:#66dd99;
}
input[type="radio"][id="green"]:checked ~ .blue, input[type="radio"][id="green"]:checked ~ .red {
  width:0;
  height:0;
  padding:0;
  margin:0;
  opacity:0;
}

.tile {
  width:23%;
  height:100px;
  float:left;
  transition:all 1s;
  margin:0.5%;
  padding:0.5%;
}
.green {
  background:#66dd99;
}
.blue {
  background:#6666ff;
}
.red {
  background:#ff4466;
}