Add CSS support for code blocks and improve format of code (& h2)

static/css/general.css

@@ -47,9 +47,21 @@ footer {
     padding: 0.5rem 0;
 }
 
+/* Code Blocks */
+pre {
+    padding: 0.75rem;
+    margin-top: 1.5rem;
+    margin-bottom: 1.5rem;
+    margin-left: auto;
+    margin-right: auto;
+    max-width: max-content;
+}
+
+/* Inline keywords/code */
 code {
     display: inline-block;
     color: green;
+    line-break: strict;
 }
 
 p {
@@ -60,6 +72,10 @@ article {
     padding: 0.5rem;
 }
 
+h2 {
+    margin-bottom: 1rem;
+}
+
 #mainarticle {
     width: max-content;
     max-width: min(80rem, 100%);