#contoh_bg{
    background-color: #eee;
    background-image: url(data:image/gif;base64,R0lGODlhCAAIAJEAAMzMzP///////wAAACH5BAEHAAIALAAAAAAIAAgAAAINhG4nudroGJBRsYcxKAA7);
}

  #tabs {
    overflow: hidden;
    width: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  #tabs li {
    float: left;
    margin: 0 -15px 0 0;
  }

  #tabs a {
    float: left;
    position: relative;
    padding: 0 10px;
    height: 0;
    line-height: 30px;
    text-transform: uppercase;
    text-decoration: none;
    color: #fff;      
    border-right: 30px solid transparent;
    border-bottom: 30px solid #3D3D3D;
    border-bottom-color: #777\9;
    opacity: .3;
    filter: alpha(opacity=30);      
  }

  #tabs a:hover,
  #tabs a:focus {
    border-bottom-color: #2ac7e1;
    opacity: 1;
    filter: alpha(opacity=100);
  }

  #tabs a:focus {
    outline: 0;
  }

  #tabs #current {
    z-index: 53;
    border-bottom-color: #3d3d3d;
    opacity: 1;
    filter: alpha(opacity=100);      
  }

  /* ----------- */
  #content {
      background: #fff;
      border-top: 2px solid #3d3d3d;
      padding: 12px 0px 0px 4px;
      font-family: Arial, Helvetica;
      /*height: 220px;*/
  }

  #content h2,
    #content h3,
    #content p {
      margin: 0 0 15px 0;
  }  

  /* Demo page only */
  #about {
      color: #999;
      text-align: center;
  }

  #about a {
      color: #777;
  }