Add header html tag to CSS for monobackgroundcolor

src/resources/formats/html/bootstrap/_bootstrap-rules.scss

@@ -907,6 +907,12 @@ pre {
 // Maps the pandoc 'monobackgroundcolor' to bootstrap
 // Note this only targets code outside of sourceCode blocks
 @if variable-exists(mono-background-color) {
+  h1 code:not(.sourceCode),
+  h2 code:not(.sourceCode),
+  h3 code:not(.sourceCode),
+  h4 code:not(.sourceCode),
+  h5 code:not(.sourceCode),
+  h6 code:not(.sourceCode),
   p code:not(.sourceCode),
   li code:not(.sourceCode),
   kbd,
@@ -918,6 +924,12 @@ pre {
 }
 
 // Default padding if background is set
+h1 code:not(.sourceCode),
+h2 code:not(.sourceCode),
+h3 code:not(.sourceCode),
+h4 code:not(.sourceCode),
+h5 code:not(.sourceCode),
+h6 code:not(.sourceCode),
 p code:not(.sourceCode),
 li code:not(.sourceCode),
 td code:not(.sourceCode) {