/* pure css toggle-able window */
.toggleable-window {
  input.toggle {display: none;}
  label {
    font-size: 3em;
    font-weight:bold;
    &:hover, &:focus {
      cursor: pointer;
    }
  }
  input.toggle:checked ~ label {font-weight:normal;}
  input.toggle:checked ~ div {display: none;}
  div {
    position: absolute;
    width: 100%;
    background: yellow;
  }
}

.container {
  position: relative;
  width: 10em;
}