github-hotkeys-boost.css

[data-hotkey]:not(.selected)::after {
  content: attr(data-hotkey);
  color: var(--color-fg-muted);
  background-color: var(--color-neutral-subtle);
  margin-left: var(--primer-control-medium-gap, 4px);
  border-radius: 2em;
  font-family: monospace;
  display: inline-block;
  font-size: var(--primer-text-body-size-small, 12px);
  font-weight: var(--base-text-weight-medium, 500);
  line-height: calc(var(--base-size-20, 20px) - var(--primer-borderWidth-thin, 1px)*2);
  min-width: var(--base-size-20, 20px);
  padding: 0 6px;
  text-align: center;
}
[data-hotkey]:not(:last-child)::after {
  margin-right: var(--primer-control-medium-gap, 4px);
}