[Feature request] Dynamically color change of the level-2 headings border

[onedonedone]

Feature request

Description

Level-2 headings border flashs when changing colors since the transition time is not consistent with the background.

Heading.mp4

Suggested solution

Since the transition style of body and code elements are set in src/client/styles/normalize.scss, I think it might be proper to add here.

// normalize.scss
...
h2 {
  border-color: var(--c-border);
  transition: border-color var(--t-color);
}
...