铺满整个页面的背景

.wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #fcc;
  padding-top: 80rpx;
  background: url({{mURL}}themes/simpleboot3/public/web/images-2/bg-select.png);
  background-repeat: no-repeat;
  background-size: cover;
  position: fixed;
}