@nutui/nutui-react/dist/es/packages/backtop/style-jmapp/style.css

京东风格的轻量级移动端 React 组件库，支持一套代码生成 H5 和小程序

/* #ifdef harmony */
/* #endif */
/* #ifndef harmony */
/* #endif */
.nut-backtop {
  display: none;
}
.nut-backtop-show {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--nutui-hoverbutton-item-size, 40px);
  height: var(--nutui-hoverbutton-item-size, 40px);
  transition: all 0.2s ease-in-out;
}
.nut-backtop-show .nut-hoverbutton-item-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}