Specify the sizes of H? relative to the normal font size as

percentages; using "large", "x-large" makes them too big for
some troublemakers.  ;-)

(Not specifying them at all causes some browsers to make them the same
size as normal text.  ;-(  )

Doc/html/style.css

@@ -29,8 +29,9 @@ BIG.XHUGE		{ font-size : xx-large }
 
 h1, h2, h3, h4, h5, h6	{ font-family: avantgarde, sans-serif;
 			  font-weight: bold }
-h1, h2			{ font-size: x-large }
-h3, h4			{ font-size: large }
+h1			{ font-size: 180% }
+h2			{ font-size: 150% }
+h3, h4			{ font-size: 120% }
 code, tt		{ font-family: courier }
 var			{ font: italic normal serif }