message: Reduce opacity of `show-whitespace`
diff: }
  [data-rgh-whitespace='tab'] {
  - background-image: url('data:image/svg+xml,%3Csvg preserveAspectRatio="xMinYMid meet" viewBox="0 0 12 24" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M9.5 10.44L6.62 8.12L7.32 7.26L12.04 11V11.44L7.28 14.9L6.62 13.9L9.48 11.78H0V10.44H9.5Z" fill="rgba(36,41,46,0.5)"/%3E%3C/svg%3E');
  + background-image: url('data:image/svg+xml,%3Csvg preserveAspectRatio="xMinYMid meet" viewBox="0 0 12 24" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M9.5 10.44L6.62 8.12L7.32 7.26L12.04 11V11.44L7.28 14.9L6.62 13.9L9.48 11.78H0V10.44H9.5Z" fill="rgba(36,41,46,25%)"/%3E%3C/svg%3E');
  background-size: calc(var(--tab-size, 4) * 1ch) 1.25em;
  }
  [data-rgh-whitespace='space'] {
  - background-image: url('data:image/svg+xml,%3Csvg preserveAspectRatio="xMinYMid meet" viewBox="0 0 12 24" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M4.5 11C4.5 10.1716 5.17157 9.5 6 9.5C6.82843 9.5 7.5 10.1716 7.5 11C7.5 11.8284 6.82843 12.5 6 12.5C5.17157 12.5 4.5 11.8284 4.5 11Z" fill="rgba(36,41,46,0.5)"/%3E%3C/svg%3E');
  + background-image: url('data:image/svg+xml,%3Csvg preserveAspectRatio="xMinYMid meet" viewBox="0 0 12 24" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M4.5 11C4.5 10.1716 5.17157 9.5 6 9.5C6.82843 9.5 7.5 10.1716 7.5 11C7.5 11.8284 6.82843 12.5 6 12.5C5.17157 12.5 4.5 11.8284 4.5 11Z" fill="rgba(36,41,46,25%)"/%3E%3C/svg%3E');
  background-size: 1ch 1.25em;
  }
  