Dark theme: release descripton doesn't look good

[wxiaoguang]

Description

https://try.gitea.io/wxiaoguang/test/releases

1. Padding/Margin
2. Background color

[zeripath]

in comments the markup gets a border:

.comment-body .markup {
  padding: 1em;
  border-radius: 0 0 var(--border-radius) var(--border-radius); /* don't render outside box */
}

We could just add gt-px-3 gt-py-3 to the class?

I guess the question is how to ensure it looks ok in the non-arc-green theme

[wxiaoguang]

I think it's caused by incorrect background color (introduced by https://github.com/go-gitea/gitea/pull/23578/files#r1149604909 )

Without the background: var(--color-box-body); or use inherit, the UI looks fine.