html,scss - fix inconsistent spacing between paragraphs and first-section headings

Author: cscheid

news/changelog-1.8.md

@@ -10,6 +10,7 @@ All changes included in 1.8:
 
 ### `html`
 
+- ([#10983](https://github.com/quarto-dev/quarto-cli/issues/10983)): Fix spacing inconsistency between paras and first section headings.
 - ([#12259](https://github.com/quarto-dev/quarto-cli/issues/12259)): Fix conflict between `html-math-method: katex` and crossref popups (author: @benkeks).
 
 ### `revealjs`

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

@@ -631,7 +631,11 @@ h1.title {
   margin-top: 0;
 }
 
-main.content > section:first-of-type > h2:first-child {
+main.content > p:has(+ section) {
+  margin-bottom: 2rem;
+}
+
+main.content > section:first-of-type > h2:nth-child(1) {
   margin-top: 0;
 }