html, body {
  margin: 0;
  padding: 0;
}

.container {
  margin: 40px;
}

.container .demo {
  margin-bottom: 100px;
}

.menu-container:before,
.menu-container:after {
  content: '';
  display: block;
  height: 0;
  clear: both;
}

.menu-container.below {
  position: relative;
}

.menu-container.below .menu {
  width: 100%;
}

.menu-container.below .menu .menu-item {
  float: left;
  border: none;
}

.menu-container.below .sub-menu {
  position: absolute;
  top: 30px;
  border: 1px #eee solid;
  border-top: none;
}

.menu, .sub-menu {
  float: left;
  height: 100%;
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px #eee solid;
}

.menu .menu-item,
.sub-menu .sub-menu-item {
  width: 100px;
  line-height: 30px;
  padding: 0 20px;
  border-top: 1px #eee solid;
  cursor: pointer;
  white-space: nowrap;
  font-size: 18px;
  font-family: monospace;
}

.menu .menu-item:first-child {
  border-top: none;
}

.menu .menu-item.active {
  color: #f40;
  border-right: 1px #fff solid;
  margin-right: -1px;
}

.sub-menu {
  border-left: none;
  min-height: 278px;
}

.sub-menu .sub-menu-item {
  width: 100%;
  border: none;
  font-size: 14px;
}

.sub-menu .sub-menu-item:hover {
  color: #f40;
}