#poststuff {

  @media only screen and (min-width:851px) and (max-width: 1360px) {
    &.@{plugin-prefix}-poststuff-container-1-collapsed {
      min-width: 1018px;
      position: relative;
      margin-right: -20px;
      overflow-x: hidden;

      #post-body {
        &.columns-2 {
          margin-right: 120px;
        }
      }

      #postbox-container-1 {
        position: relative;
        z-index: 1;

        body.stk-preview-enabled & {
          z-index: 10;
        }

        margin-right: -370px !important;
        margin-top: -5px;
        padding: 5px 20px 0;

        background: fadeout(@wp-background, 100%);
        transition: transform .2s .4s, z-index 0s .6s, background 0s .6s;
      }

      #postbox-container-1:hover {
        z-index: 110;
        background: @wp-background;
        transition: transform .2s .4s, z-index 0s .4s, background 0s .4s;
        transform: translateX(-250px);
      }
    }
  }

  @media only screen and (min-width: 1361px) {
    #post-body-content {
      /* For compatibility with Meta Box plugin and z-index:0 on div.postarea.
         https://metabox.io/support/topic/bug-color-picker-field-is-showed-below-the-title-field/ */
      position: relative;
      z-index: 100;
    }
  }
}