Limited height Repository Files listing, on GitHub

css_to_inject.css

[aria-labelledby="files"] {
  overflow-y: auto;
  max-height: 46vh;

  /* Add a shadow to the edges with scroll-hidden content */
  background:
    /* Shadow covers */
    linear-gradient(white 30%, rgba(255, 255, 255, 0)),
    linear-gradient(rgba(255, 255, 255, 0), white 70%) 0 100%,
    /* Shadows */
    radial-gradient(50% 0, farthest-side, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)),
    radial-gradient(50% 100%, farthest-side, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)) 0 100%;
  background:
    /* Shadow covers */
    linear-gradient(white 30%, rgba(255, 255, 255, 0)),
    linear-gradient(rgba(255, 255, 255, 0), white 70%) 0 100%,
    /* Shadows */
    radial-gradient(farthest-side at 50% 0, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)),
    radial-gradient(farthest-side at 50% 100%, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)) 0 100%;

  background-repeat: no-repeat;
  background-color: white;
  background-size: 100% 40px, 100% 40px, 100% 14px, 100% 14px;
  background-attachment: local, local, scroll, scroll;
}