  .root
      font: inherit
      background: transparent
      border: none
      appearance: none
      background-color: var(--color-back)
      background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23929e9b%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E')
 
</s> remove     .crumbs
 </s> add     .root
        flex: 100%
        width: 100%
        margin-top: var(--height-nav)
        display: block

    .section </s> remove         text-shadow: 0 0 0 var(--color-theme)
 </s> add         text-shadow: 0 0 0 var(--dropdown-text-color) </s> remove @include breakpoint(max, sm)
    .section
        flex: 1 1 0
        padding: 1.25rem 0
        border-bottom: 1px solid var(--color-subtle)
        margin: 0

        &:not(:last-child)
            border-right: 1px solid var(--color-subtle)

 </s> add  </s> remove @include breakpoint(min, md)
    .root
        @include scroll-shadow(var(--color-back), var(--color-shadow), var(--height-nav))
        position: fixed
        top: 0
        left: 0
        width: var(--width-sidebar)
        height: calc(100vh - 3px)
        flex: 0 0 var(--width-sidebar)
        padding-top: calc(var(--height-nav) + 1.5rem)
        z-index: 10
        padding-bottom: 5rem
 </s> add .dropdown
    padding: 1rem 0
    border-bottom: 1px solid var(--color-subtle)
    width: 100%
    --dropdown-text-color: var(--color-front)
  .root
    --dropdown-text-color: var(--color-front)
      font: inherit
      background: transparent
      border: none
      appearance: none
      background-color: var(--color-back)
      background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23929e9b%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E')
add keep keep keep keep keep keep
 Use dropdown for collapsed sidebar menu 
website/src/styles/dropdown.module.sass