html5/render/browser/extend/components/scrollable/refresh/refresh.css

.weex-refresh {
  // -webkit-box-align: center;
  // -webkit-align-items: center;
  // align-items: center;
  // -webkit-box-pack: center;
  // -webkit-justify-content: center;
  // justify-content: center;
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  z-index: 999999;
  background-color: #666;
}