fix(theme): prevent `sub` and `sup` elements from affecting line height

based on normalize.css

closes #5173

src/client/theme-default/styles/base.css

@@ -241,6 +241,22 @@
     overflow-wrap: break-word;
   }
 
+  sub,
+  sup {
+    font-size: 75%;
+    line-height: 0;
+    position: relative;
+    vertical-align: baseline;
+  }
+
+  sub {
+    bottom: -0.25em;
+  }
+
+  sup {
+    top: -0.5em;
+  }
+
   vite-error-overlay {
     z-index: 9999;
   }