antd-mobile/cjs/components/scroll-mask/scroll-mask.css

<div align="center">

.adm-scroll-mask {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 1;
  width: 30px;
  height: 100%;
  pointer-events: none;
}
.adm-scroll-mask-left {
  left: 0;
  background: linear-gradient(to right, var(--adm-color-background), rgba(255, 255, 255, 0));
}
.adm-scroll-mask-right {
  right: 0;
  background: linear-gradient(to left, var(--adm-color-background), rgba(255, 255, 255, 0));
}