Improvements in performance / Better structure

styles/globals.css

@@ -9,7 +9,7 @@ body {
 body {
   color: black;
   background: #FAFAFA;
-  padding-inline: 2em;
+  padding: 2em;
 }
 
 a {
@@ -21,6 +21,19 @@ a {
   box-sizing: border-box;
 }
 
+:is(h1, h2, h3, h4, h5, h6):is(:first-child) {
+  margin-block-start: 0;
+}
+
+h3 {
+  margin-block: 1.5em 1em;
+}
+
+h4 {
+  margin-block: 1em 0.3em;
+  font-weight: 500;
+}
+
 @media (prefers-color-scheme: dark) {
   html {
     color-scheme: dark;