AdminLTE/build/scss/_sidebar-mini.scss

//
// Core: Sidebar Mini
//

.sidebar-mini.sidebar-collapse {
  .main-sidebar {
    min-width: $sidebar-mini-width;
    max-width: $sidebar-mini-width;
  }

  // Make the sidebar headers
  .nav-sidebar .nav-header {
    display: none;
  }

  .nav-sidebar .nav-link span {
    width: 0;
    white-space: nowrap;
  }

  .sidebar .user-panel > .info,
  .nav-sidebar .nav-link span,
  .brand-link {
    margin-left: -10px;
    animation-name: fadeOut;
    animation-duration: $transition-speed;
    animation-fill-mode: both;
    visibility: hidden;
  }

  .brand-link {
    order: 2;
    margin-left: auto;
  }

  .sidebar-mini-icon {
    order: 1;
    margin-left: 1rem;
  }

  &.layout-fixed.sidebar-hover {
    .main-sidebar {
      min-width: $sidebar-width;
      max-width: $sidebar-width;
    }

    .nav-sidebar .nav-header {
      display: block;
    }

    .sidebar .user-panel > .info,
    .nav-sidebar .nav-link span,
    .brand-link {
      margin-left: 0;
      animation-name: fadeIn;
      animation-duration: $transition-speed;
      animation-fill-mode: both;
      visibility: visible;
    }

    .brand-link {
      order: 1;
    }

    .sidebar-mini-icon {
      order: 2;
      margin-left: auto;
    }
  }
}

.sidebar-mini.sidebar-collapse:not(.layout-fixed) {
  .sidebar {
    overflow: visible;

    .nav-sidebar .nav-item:hover {
      position: relative;

      .nav-link {
        border-top-right-radius: 0;
        border-bottom-right-radius: 0;
      }

      span {
        animation: none;
        z-index: $zindex-sidebar + 12;
        visibility: visible;
        display: inline-block;
        position: absolute;
        width: $sidebar-width;
        left: $sidebar-mini-width;
        top: 0;
        background-color: inherit;
        padding: inherit;
        padding-left: 1rem;
        margin-left: -1rem;
        border-top-left-radius: 0;
        border-bottom-left-radius: 0;
      }
    }
  }
}

.sidebar-is-opening {
  .sidebar .user-panel > .info,
  .nav-sidebar .nav-link span,
  .brand-link {
    margin-left: 0;
    animation-name: fadeIn;
    animation-duration: $transition-speed;
    animation-fill-mode: both;
    visibility: visible;
  }
}

.sidebar-is-collapsing {
  .sidebar .user-panel > .info,
  .nav-sidebar .nav-link span,
  .brand-link {
    margin-left: -10px;
    animation-name: fadeOut;
    animation-duration: $transition-speed;
    animation-fill-mode: both;
    visibility: visible;
  }
}

//