#buttons {
  position: relative;
  border: solid 1px #aaa;
  display: inline-block;
  width: 100%;
  border-radius: 10px;
  height: 50px;
  overflow: hidden;
  margin-bottom: 20px;
  box-sizing: border-box;
}

.button {
  display: inline-block;
  background: #ccc;
  color: black;
  height: 50px;
  width: 33%;
  margin: 0;
  margin-right: -3px;
  text-align: center;
  line-height: 45px;
  font-size: 25px;
  cursor: pointer;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.button:hover {
  background: #eee;
}

.button:active {
  background: #ddd;
}

.button.active {
  color: white;
  background: #888;
}

.button:nth-child(2) {
  width: 34%;
  border-left: solid 1px #aaa;
  border-right: solid 1px #aaa;
}

.highlight {
  display: none;
}

.highlight.active {
  display: block;
}

.zone {
  display: none;
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
}

.zone.active {
  display: block;
}

.zone > h1 {
  position: absolute;
  padding: 10px 10px;
  margin: 0;
  color: white;
  right: 0;
  bottom: 0;
}

.zone.dynamic {
  background: rgba(0, 0, 255, 0.1);
}

.zone.semi {
  background: rgba(255, 255, 255, 0.1);
}

.zone.static {
  background: rgba(255, 0, 0, 0.1);
}