AdminLTE/scss/layout/_main-sidebar.scss

//
// Core: Main Sidebar
//

// Default Sidebar Variant
@include sidebar-variant(
  $sidebar-dark-bg,
  $sidebar-dark-hover-bg,
  $sidebar-dark-color,
  $sidebar-dark-hover-color,
  $sidebar-dark-active-color,
  $sidebar-dark-submenu-bg,
  $sidebar-dark-submenu-color,
  $sidebar-dark-submenu-hover-color,
  $sidebar-dark-submenu-hover-bg,
  $sidebar-dark-submenu-active-color,
  $sidebar-dark-submenu-active-bg
);

.main-sidebar {
  grid-area: main-sidebar;
  @include transition($sidebar-transition);
  z-index: $zindex-sidebar;
  min-width: $sidebar-width;
  max-width: $sidebar-width;
}