gitea/web_src/css/repo/file-view.css

.file-view tr.active {
  background: var(--color-highlight-bg);
}

.file-view tr.active:last-of-type .lines-code {
  border-bottom-right-radius: var(--border-radius);
}

.file-view tr.active .lines-num {
  position: relative;
}

.file-view tr.active .lines-num::before {
  content: "";
  position: absolute;
  left: 0;
  width: 2px;
  height: 100%;
  background: var(--color-highlight-fg);
}

.file-view .file-not-rendered-prompt {
  padding: 1rem;
  text-align: center;
  font-size: 1rem !important; /* use consistent styles for various containers (code, markup, etc) */
  line-height: var(--line-height-default) !important; /* same as above */
}

/* ".code-view" is always used with ".file-view", to show the code of a file */
.file-view.code-view {
  background: var(--color-code-bg);
  border-radius: var(--border-radius);
}

.file-view.code-view table {
  width: 100%;
}

.file-view.code-view .lines-num span::after {
  cursor: pointer;
}

.file-view.code-view .lines-num:hover {
  color: var(--color-text-dark);
}

.file-view.code-view .ui.button.code-line-button {
  border: 1px solid var(--color-secondary);
  padding: 1px 4px;
  margin: 0;
  min-height: 0;
  position: absolute;
  left: 6px;
}

.file-view.code-view .ui.button.code-line-button:hover {
  background: var(--color-secondary);
}