diff --git a/assets/css/base/_typography.scss b/assets/css/base/_typography.scss
index cbe2a88..3b08501 100644
--- a/assets/css/base/_typography.scss
+++ b/assets/css/base/_typography.scss
@@ -44,7 +44,7 @@ html {
   color: $dark;
   background-color: $light;
   font-family: $default-font;
-  font-variant-numeric: 'oldstyle-nums slashed-zero';
+  font-variant-numeric: oldstyle-nums slashed-zero;
   writing-mode: horizontal-tb;
 }
 
@@ -305,7 +305,9 @@ kbd {
   font-family: Arial, Helvetica, sans-serif;
   background-color: #f7f7f7;
   color: #333;
-  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 2px white inset;
+  box-shadow:
+    0 1px 0 rgba(0, 0, 0, 0.2),
+    0 0 0 2px white inset;
   border-radius: 3px;
   display: inline-block;
   margin-block: 0;
@@ -350,3 +352,8 @@ kbd {
 dfn {
   font-variant: small-caps;
 }
+
+sub,
+sup {
+  line-height: 0;
+}