html5/render/browser/extend/components/switch/switch.css

/* switch defaults. */
.weex-switch {
  background-color: #fff;
  border: 1px solid #dfdfdf;
  cursor: pointer;
  display: inline-block;
  position: relative;
  vertical-align: middle;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
  box-sizing: content-box;
  background-clip: content-box;
}

.weex-switch > small {
  background: #fff;
  border-radius: 100%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  position: absolute;
  top: 0;
}