eat: no-repeat;
        float: left;
        width: 20px;
        height: 20px;
      }

      .op_x-7  { background-position:  -7% 50% }
      .op_x13  { background-position:  13% 50% }
      .op_x23  { background-position:  23% 50% }
      .op_x50  { background-position:  50% 50% }
      .op_x75  { background-position:  75% 50% }
      .op_x88  { background-position:  88% 50% }
      .op_x111 { background-position: 111% 50% }

    </style>
  </head>
  <body>
    <div class="op_x-7"></div>
    <div class="