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                <section id="contents">
  <label for="menu" class="menu_icon"><span></span></label>

<input type="checkbox" id="menu">

<section id="drawer">
  <label for="menu">とじる</label>


  $icon_size: 30px
  $icon_weight: 2px
  width: $icon_size
  height: $icon_size - 5px
  position: relative
  display: block
  cursor: pointer
  &::before, &::after
    content: ""
    width: $icon_size
    height: $icon_weight
    position: absolute
    left: 0
    background: #333
    top: calc(50% - #{$icon_weight / 2})
    bottom: 0
  > span
    width: $icon_size
    height: $icon_weight
    position: absolute
    background: #333

  width: 300px
  position: fixed
  top: 0
  left: 0
  background: #ddd
  transform: translateX(-300px)
  transition: transform 300ms ease

  // ここが問題のコード
  height: 100vh
  overflow-y: auto
  // ここまで
    list-style: none
    padding: 10px
    > li
      padding: 5px 0
  display: none
  &:checked + #drawer
    transform: translateX(0)