body {
  margin: 0;
}
#html, #css, #js, #result {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: calc(100% - 54px);
  border: none;
}
.tab-bar {
  overflow: hidden;
  background-color: #EEE;
  border-bottom: 5px solid black;
}
.tab {
  font-size: 25px;
  float: left;
  border: none;
  padding: 10px;
  cursor: pointer;
  background-color: inherit;
  text-decoration: none;
  color: black;
}
.tab:hover {
  background-color: #DDD;
}
.tab.active {
  background-color: black;
  color: white;
}
.tab-content {
  display: none;
  padding: 8px;
  overflow-wrap: break-word;
}