html, body {
  height: 100%;
}

body {
  margin: 0;
  background-color: #465176;
  overflow: hidden;
}

.selector {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 140px;
  height: 140px;
  margin-top: -70px;
  margin-left: -70px;
}

.selector, .selector button {
  font-family: 'Source Sans Pro', sans-serif;
  font-weight: 300;
}

.selector button {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 10px;
  background: #465176;
  border-radius: 50%;
  border: 0;
  color: white;
  font-size: 20px;
  cursor: pointer;
  transition: all .1s;
}

.selector button:focus {
  outline: none;
}

.selector ul {
  position: absolute;
  list-style: none;
  padding: 0;
  margin: 0;
  top: -20px;
  right: -20px;
  bottom: -20px;
  left: -20px;
}

.selector li {
  position: absolute;
  width: 0;
  height: 150%;
  margin: -25% 50%;
  -webkit-transform: rotate(-360deg);
  transition: all 0.8s ease-in-out;
}

.selector li input {
  display: none;
}

.selector li input + label {
  position: absolute;
  left: 50%;
  bottom: 100%;
  width: 0;
  height: 0;
  line-height: 1px;
  margin-left: 0;
  background: #4f5b84;
  border-radius: 50%;
  text-align: center;
  font-size: 1px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: none;
  transition: all 0.8s ease-in-out, color 0.1s, background 0.1s;
}

.selector li input + label:hover {
  background: #081a3f;
}

.selector li input:checked + label {
  background: #4f5b84;
  color: white;
}

.selector li input:checked + label:hover {
  background: #4f5b84;
}

.selector.open li input + label {
  width: 120px;
  height: 120px;
  line-height: 80px;
  margin-left: -60px;
  font-size: 14px;
}