Index: src/wp-content/themes/twentytwenty/style-rtl.css
===================================================================
--- src/wp-content/themes/twentytwenty/style-rtl.css	(revision 55970)
+++ src/wp-content/themes/twentytwenty/style-rtl.css	(working copy)
@@ -133,6 +133,9 @@
 	font-size: 1.8rem;
 	letter-spacing: -0.015em;
 	text-align: right;
+	display: flex;
+	flex-direction: column;
+	min-height: 100vh;
 }
 
 @supports ( font-variation-settings: normal ) {
@@ -153,6 +156,7 @@
 
 #site-content {
 	overflow: hidden;
+	flex: 1;
 }
 
 
Index: src/wp-content/themes/twentytwenty/style.css
===================================================================
--- src/wp-content/themes/twentytwenty/style.css	(revision 55970)
+++ src/wp-content/themes/twentytwenty/style.css	(working copy)
@@ -133,6 +133,9 @@
 	font-size: 1.8rem;
 	letter-spacing: -0.015em;
 	text-align: left;
+	display: flex;
+	flex-direction: column;
+	min-height: 100vh;
 }
 
 @supports ( font-variation-settings: normal ) {
@@ -153,6 +156,7 @@
 
 #site-content {
 	overflow: hidden;
+	flex: 1;
 }