.ttk-float-box {
  &.box-left {
    float: left;
  }
  &.box-right {
    float: right;
  }
  &.box-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%); 	/* IE 9 */
    -moz-transform: translate(-50%, -50%); 	/* Firefox */
    -webkit-transform: translate(-50%, -50%); /* Safari 和 Chrome */
    -o-transform: translate(-50%, -50%) 	/* Opera */
  }
}