AfterAales/themes/next/source/css/_common/outline/sidebar/sidebar-toggle.styl

.sidebar-toggle {
  background: $black-deep;
  bottom: 45px;
  cursor: pointer;
  height: 14px;
  left: $b2t-position-right;
  padding: 5px;
  position: fixed;
  width: 14px;
  z-index: $zindex-3;

  +tablet-mobile() {
    left: $b2t-position-right-mobile;
    opacity: $b2t-opacity-hover;

    if (!hexo-config('sidebar.onmobile')) {
      display: none;
    }
  }
}

.sidebar-toggle:hover .toggle-line {
  background: $sidebar-highlight;
}