.input-val {
        width: 200px;
        height: 32px;
        border: 1px solid #ddd;
        box-sizing: border-box;
      }
      #canvas {
        vertical-align: middle;
        box-sizing: border-box;
        border: 1px solid #ddd;
        cursor: pointer;
      }
      .btn {
        display: center;
        margin-top: 20px;
        height: 32px;
        width: 100px;
        font-size: 16px;
        color: #fff;
        background-color: #457adb;
        border: none;
        border-radius: 50px;
      }