nt: "";
      position: absolute;
      top: -6px;
      height: 5px;
      width: 5px;
      background: #fa5555;
      border-radius: 50%;
      border: 4px solid #fa5555;
      box-shadow: 0 0 0.7em #fff, 0 0 2em #fa5555;
    }

    .vb:hover .dot,
    .vb:focus .dot {
      animation: atom 2s infinite linear;
      display: block;
    }

    /*calc(122px - 36px)  按钮宽度 - dot宽度 - 边框宽度*/
    @keyframes atom {
      0% {
        transform: translateX(0) rotate(0);
      }

      30% {
  