background-attachment实现css滚动指示器
.scroll-shadows {
max-height: 200px;
overflow: auto;
-webkit-overflow-scrolling: touch;
overflow-scrolling: touch;
background:
/* Shadow Cover TOP */
linear-gradient(
white 30%,
rgba(255, 255, 255, 0)
) center top,
/* Shadow Cover BOTTOM */
linear-gradient(
rgba(255, 255, 255, 0),
white 70%
) center bottom,
/* Shadow TOP */
radial-gradient(
farthest-side at 50% 0,
rgba(0, 0, 0, 0.2),
rgba(0, 0, 0, 0)
) center top,
/* Shadow BOTTOM */
radial-gradient(
farthest-side at 50% 100%,
rgba(0, 0, 0, 0.2),
rgba(0, 0, 0, 0)
) center bottom;
background-repeat: no-repeat;
background-size: 100% 40px, 100% 40px, 100% 14px, 100% 14px;
background-attachment: local, local, scroll, scroll;
}https://css-tricks.com/scroll-shadows-pure-css-parallax-game-back-on/
