normalize styles for sub and sup

Author: mojavelinux

preview-src/index.adoc

@@ -22,6 +22,8 @@ https://example.org[Curabitur,role=unresolved] ut massa aliquam, cursus enim et,
 
 Nominavi luptatum eos, an vim hinc philosophia intellegebat.
 Lorem pertinacia `expetenda` et nec, [.underline]#wisi# illud [.line-through]#sonet# qui ea.
+H~2~0.
+E = mc^2^.
 Eum an doctus <<liber-recusabo,maiestatis efficiantur>>.
 Eu mea inani iriure.
 

src/css/base.css

@@ -52,6 +52,22 @@ th {
   font-weight: var(--body-font-weight-bold);
 }
 
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
 em em { /* stylelint-disable-line */
   font-style: normal;
 }