gitea/web_src/css/markup/codepreview.css

.markup .code-preview-container {
  border: 1px solid var(--color-secondary);
  border-radius: var(--border-radius);
  margin: 0.25em 0;
}

.markup .code-preview-container .code-preview-header {
  border-bottom: 1px solid var(--color-secondary);
  padding: 0.5em;
  font-size: 12px;
}

.markup .code-preview-container table {
  width: 100%;
  max-height: 240px; /* 12 lines at 20px per line */
  overflow-y: auto;
  margin: 0; /* override ".markup table {margin}" */
}

/* workaround to hide empty p before container - more details are in "html_codepreview.go" */
.markup p:empty:has(+ .code-preview-container) {
  display: none;
}

/* override the polluted styles from the content.css: ".markup table ..." */
.markup .code-preview-container table tr {
  border: 0 !important;
}
.markup .code-preview-container table th,
.markup .code-preview-container table td {
  border: 0 !important;
  padding: 0 0 0 5px !important;
}
.markup .code-preview-container table tr:nth-child(2n) {
  background: none !important;
}