More complete and Sass-y fix for Ckeditor in Active Admin.

active_admin_ckeditor_patch.css.scss

body.active_admin {
   .cke {
      display: inline-block;

      table { width: auto; }

      width: 78%;
  }

   .cke_button_label {
      display: none;
      padding-left: 3px;
      margin-top: 1px;
      line-height: 17px;
      vertical-align: middle;
      float: left;
      cursor: default;
      color: #474747;
      text-shadow: 0 1px 0 rgba(255,255,255,.5);
  }

   a.cke_button {
      display: inline-block;
      height: 18px;
      padding: 4px 6px;
      outline: 0;
      cursor: default;
      float: left;
      border: 0;
  }

   .cke_button_icon {
      cursor: inherit;
      background-repeat: no-repeat;
      margin-top: 1px;
      width: 16px;
      height: 16px;
      float: left;
      display: inline-block;
  }

   .cke_top {
      border-bottom: 1px solid #b6b6b6;
      padding: 6px 8px 2px;
      -moz-box-shadow: 0 1px 0 #fff inset;
      -webkit-box-shadow: 0 1px 0 #fff inset;
      box-shadow: 0 1px 0 #fff inset;
      background: #cfd1cf;
      background-image: -webkit-gradient(linear,left top,left bottom,from(#f5f5f5),to(#cfd1cf));
      background-image: -moz-linear-gradient(top,#f5f5f5,#cfd1cf);
      background-image: -webkit-linear-gradient(top,#f5f5f5,#cfd1cf);
      background-image: -o-linear-gradient(top,#f5f5f5,#cfd1cf);
      background-image: -ms-linear-gradient(top,#f5f5f5,#cfd1cf);
      background-image: linear-gradient(top,#f5f5f5,#cfd1cf);
      filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#fff5f5f5',endColorstr='#ffcfd1cf');
  }

  .cke_bottom {
      padding: 6px 8px 2px;
      position: relative;
      border-top: 1px solid #bfbfbf;
      -moz-box-shadow: 0 1px 0 #fff inset;
      -webkit-box-shadow: 0 1px 0 #fff inset;
      box-shadow: 0 1px 0 #fff inset;
      background: #cfd1cf;
      background-image: -webkit-gradient(linear,left top,left bottom,from(#ebebeb),to(#cfd1cf));
      background-image: -moz-linear-gradient(top,#ebebeb,#cfd1cf);
      background-image: -webkit-linear-gradient(top,#ebebeb,#cfd1cf);
      background-image: -o-linear-gradient(top,#ebebeb,#cfd1cf);
      background-image: -ms-linear-gradient(top,#ebebeb,#cfd1cf);
      background-image: linear-gradient(top,#ebebeb,#cfd1cf);
      filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#ffebebeb',endColorstr='#cfd1cf');
  }

  .cke_path {
      float: left;
      margin: -2px 0 2px;
  }

  .cke_path_item, .cke_path_empty {
    display: inline-block;
    float: left;
    padding: 3px 4px;
    margin-right: 2px;
    cursor: default;
    text-decoration: none;
    outline: 0;
    border: 0;
    color: #4c4c4c;
    text-shadow: 0 1px 0 #fff;
    font-weight: bold;
    font-size: 11px;
  }

  .cke_toolgroup {
      float: left;
      margin: 0 6px 5px 0;
      border: 1px solid #a6a6a6;
      border-bottom-color: #979797;
      -moz-border-radius: 3px;
      -webkit-border-radius: 3px;
      border-radius: 3px;
      -moz-box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
      -webkit-box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
      box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
      background: #e4e4e4;
      background-image: -webkit-gradient(linear,left top,left bottom,from(#fff),to(#e4e4e4));
      background-image: -moz-linear-gradient(top,#fff,#e4e4e4);
      background-image: -webkit-linear-gradient(top,#fff,#e4e4e4);
      background-image: -o-linear-gradient(top,#fff,#e4e4e4);
      background-image: -ms-linear-gradient(top,#fff,#e4e4e4);
      background-image: linear-gradient(top,#fff,#e4e4e4);
      filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#ffffffff',endColorstr='#ffe4e4e4');
  }

  .cke_combo_button {
    display: inline-block;
    float: left;
    margin: 0 6px 5px 0;
    border: 1px solid #a6a6a6;
    border-bottom-color: #979797;
    @include border-radius(3px);
    -moz-box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
    -webkit-box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
    box-shadow: 0 1px 0 rgba(255,255,255,.5),0 0 2px rgba(255,255,255,.15) inset,0 1px 0 rgba(255,255,255,.15) inset;
    background: #e4e4e4;
    background-image: -webkit-gradient(linear,left top,left bottom,from(#fff),to(#e4e4e4));
    background-image: -moz-linear-gradient(top,#fff,#e4e4e4);
    background-image: -webkit-linear-gradient(top,#fff,#e4e4e4);
    background-image: -o-linear-gradient(top,#fff,#e4e4e4);
    background-image: -ms-linear-gradient(top,#fff,#e4e4e4);
    background-image: linear-gradient(top,#fff,#e4e4e4);
    filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#ffffffff',endColorstr='#ffe4e4e4');
  }

  .cke_dialog_body {
    border: 1px solid #b2b2b2;
    border-bottom-color: #999;
  }
  
  .cke_dialog_title {
    padding: 6px 10px;
    border-bottom: 1px solid #999;
  }

  .cke_combo_text {
    line-height: 26px;
    padding-left: 10px;
    text-overflow: ellipsis;
    overflow: hidden;
    float: left;
    cursor: default;
    color: #474747;
    text-shadow: 0 1px 0 rgba(255,255,255,.5);
    width: 60px;
  }

  .cke_combo_button {
    margin: 0 6px 5px 0;
  }

  .cke_toolbar_separator {
    margin: 5px 2px 0;
  }

  .cke_chrome {
    border: 1px solid #b6b6b6;
  }

  .cke_resizer {
    border-width: 10px 10px 0 0;
    border-color: transparent #666 transparent transparent;
    border-style: dashed solid dashed dashed;
  }

  .cke_combo_arrow {
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    border-top: 3px solid #474747;
    margin: 11px 0 0;
  }

  .cke_combo_open {
    margin: 1px 7px 1px;
  }

  .cke_dialog_tabs {
    margin: 5px 0 0;
  }

  .cke_dialog_tab {
    padding: 4px 8px;
    margin-right: 3px;
    border: 1px solid #bfbfbf;
  }

  .cke_dialog_contents_body {
    padding: 17px 10px 5px 10px;
    margin-top: 22px;
  }

  .cke_dialog_ui_vbox table, .cke_dialog_ui_hbox table {
    margin: auto;
  }

  .cke_dialog_ui_vbox_child {
    padding: 5px 0;
  }

  .cke_dialog_contents {
    padding: 15px 10px 5px 10px;
    margin-top: 30px;
    border-top: 1px solid #bfbfbf;
    -moz-border-radius: 0 0 3px 3px;
    -webkit-border-radius: 0 0 3px 3px;
    border-radius: 0 0 3px 3px;
  }

  a.cke_dialog_ui_button {
    padding: 3px 0;
    margin: 0;
    vertical-align: middle;
    border: 1px solid #b6b6b6;
    border-bottom-color: #999;
  }

  span.cke_dialog_ui_button {
    padding: 0 12px;
  }
}