site/themes/minimo/src/stylesheets/layouts/sidebar/_sidebar.scss

.sidebar {
  visibility: hidden;

  float: left;
  left: -$sidebar__width;
  position: absolute;

  width: $sidebar__width;
  max-width: 100%;
  min-height: 100%;
  padding: 2em 0;
  margin-right: -100%;

  outline: 0;
  z-index: 99999;
  transition: left $transition-duration;

  text-align: right;
  background: $color__pure-white;

  &.toggled {
    visibility: visible;
    left: 0;
  }

  .sep-after {
    &:after {
      margin-left: auto;
    }
  }

  @include screen($breakpoint-medium) {
    visibility: visible;
    left: 0;
  }
}

.sidebar-toggler {
  background: none;
  border: 0;

  .icon {
    @include font-size(1.25);
  }

  &:focus,
  &:hover,
  &:active {
    background: none;
  }

  .main & {
    padding: 0;
    position: absolute;
    right: $container__gutter;

    &[aria-expanded='true'] {
      display: none;
    }

    .close {
      display: none;
    }
  }

  .main-menu & {
    position: static;
    margin-right: 0.75em;

    &[aria-expanded='true'] {
      display: inline-block;
    }
  }

  .sidebar & {
    position: absolute;
    top: 0.5em;
    left: 0.5em;

    z-index: 2027;

    .open {
      display: none;
    }
  }

  @include screen($breakpoint-medium) {
    display: none;
  }
}

.sidebar-overlay {
  display: none;

  .sidebar.toggled & {
    display: block;

    &:after {
      content: '';
      display: block;
      position: fixed;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      z-index: -2027;

      background: $color__pure-white;
      opacity: 0.75;
    }

    @include screen($breakpoint-medium) {
      display: none;
    }
  }
}