Index: wp-content/themes/twentytwentyone/assets/css/ie.css
===================================================================
--- wp-content/themes/twentytwentyone/assets/css/ie.css	(revision 50021)
+++ wp-content/themes/twentytwentyone/assets/css/ie.css	(working copy)
@@ -6341,11 +6341,6 @@
 	padding-top: 15px;
 	padding-bottom: 8px;
 }
-
-.menu-button-container #primary-mobile-menu {
-	margin-left: auto;
-	padding: 10px 15px;
-}
 @media only screen and (max-width: 481px) {
 
 	.menu-button-container {
@@ -6353,8 +6348,10 @@
 	}
 }
 
-.menu-button-container .button.button {
+.menu-button-container #primary-mobile-menu {
 	display: flex;
+	margin-left: auto;
+	padding: 10px 15px;
 	font-size: 1rem;
 	font-weight: 500;
 	background-color: transparent;
@@ -6362,33 +6359,33 @@
 	color: #28303d;
 }
 
-.menu-button-container .button.button .dropdown-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon {
 	display: flex;
 	align-items: center;
 }
 
-.menu-button-container .button.button .dropdown-icon .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon .svg-icon {
 	margin-left: 5px;
 }
 
-.menu-button-container .button.button .dropdown-icon.open .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon.open .svg-icon {
 	position: relative;
 	top: -1px;
 }
 
-.menu-button-container .button.button .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu .dropdown-icon.close {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.open {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.open {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	display: flex;
 }
 
-.has-logo.has-title-and-tagline .menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.has-logo.has-title-and-tagline .menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	animation-name: twentytwentyone-close-button-transition;
 	animation-duration: 0.3s;
 }
Index: wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss
===================================================================
--- wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss	(revision 50021)
+++ wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss	(working copy)
@@ -10,18 +10,15 @@
 	padding-top: calc(0.5 * var(--global--spacing-vertical));
 	padding-bottom: calc(0.25 * var(--global--spacing-vertical));
 
-	#primary-mobile-menu {
-		margin-left: auto;
-		padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
-	}
-
 	@include media(mobile-only) {
 		display: flex;
 	}
 
-	// Override specificty from default button styles.
-	.button.button {
+	// Override specificity from default button styles.
+	#primary-mobile-menu {
 		display: flex;
+		margin-left: auto;
+		padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
 		font-size: var(--primary-nav--font-size-button);
 		font-weight: var(--primary-nav--font-weight-button);
 		background-color: transparent;
Index: wp-content/themes/twentytwentyone/style-rtl.css
===================================================================
--- wp-content/themes/twentytwentyone/style-rtl.css	(revision 50021)
+++ wp-content/themes/twentytwentyone/style-rtl.css	(working copy)
@@ -4567,11 +4567,6 @@
 	padding-top: calc(0.5 * var(--global--spacing-vertical));
 	padding-bottom: calc(0.25 * var(--global--spacing-vertical));
 }
-
-.menu-button-container #primary-mobile-menu {
-	margin-right: auto;
-	padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
-}
 @media only screen and (max-width: 481px) {
 
 	.menu-button-container {
@@ -4579,8 +4574,10 @@
 	}
 }
 
-.menu-button-container .button.button {
+.menu-button-container #primary-mobile-menu {
 	display: flex;
+	margin-right: auto;
+	padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
 	font-size: var(--primary-nav--font-size-button);
 	font-weight: var(--primary-nav--font-weight-button);
 	background-color: transparent;
@@ -4588,33 +4585,33 @@
 	color: var(--primary-nav--color-link);
 }
 
-.menu-button-container .button.button .dropdown-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon {
 	display: flex;
 	align-items: center;
 }
 
-.menu-button-container .button.button .dropdown-icon .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon .svg-icon {
 	margin-right: calc(0.25 * var(--global--spacing-unit));
 }
 
-.menu-button-container .button.button .dropdown-icon.open .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon.open .svg-icon {
 	position: relative;
 	top: -1px;
 }
 
-.menu-button-container .button.button .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu .dropdown-icon.close {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.open {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.open {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	display: flex;
 }
 
-.has-logo.has-title-and-tagline .menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.has-logo.has-title-and-tagline .menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	animation-name: twentytwentyone-close-button-transition;
 	animation-duration: 0.3s;
 }
Index: wp-content/themes/twentytwentyone/style.css
===================================================================
--- wp-content/themes/twentytwentyone/style.css	(revision 50021)
+++ wp-content/themes/twentytwentyone/style.css	(working copy)
@@ -4587,11 +4587,6 @@
 	padding-top: calc(0.5 * var(--global--spacing-vertical));
 	padding-bottom: calc(0.25 * var(--global--spacing-vertical));
 }
-
-.menu-button-container #primary-mobile-menu {
-	margin-left: auto;
-	padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
-}
 @media only screen and (max-width: 481px) {
 
 	.menu-button-container {
@@ -4599,8 +4594,10 @@
 	}
 }
 
-.menu-button-container .button.button {
+.menu-button-container #primary-mobile-menu {
 	display: flex;
+	margin-left: auto;
+	padding: calc(var(--button--padding-vertical) - (0.25 * var(--global--spacing-unit))) calc(0.5 * var(--button--padding-horizontal));
 	font-size: var(--primary-nav--font-size-button);
 	font-weight: var(--primary-nav--font-weight-button);
 	background-color: transparent;
@@ -4608,33 +4605,33 @@
 	color: var(--primary-nav--color-link);
 }
 
-.menu-button-container .button.button .dropdown-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon {
 	display: flex;
 	align-items: center;
 }
 
-.menu-button-container .button.button .dropdown-icon .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon .svg-icon {
 	margin-left: calc(0.25 * var(--global--spacing-unit));
 }
 
-.menu-button-container .button.button .dropdown-icon.open .svg-icon {
+.menu-button-container #primary-mobile-menu .dropdown-icon.open .svg-icon {
 	position: relative;
 	top: -1px;
 }
 
-.menu-button-container .button.button .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu .dropdown-icon.close {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.open {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.open {
 	display: none;
 }
 
-.menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	display: flex;
 }
 
-.has-logo.has-title-and-tagline .menu-button-container .button.button[aria-expanded*=true] .dropdown-icon.close {
+.has-logo.has-title-and-tagline .menu-button-container #primary-mobile-menu[aria-expanded*=true] .dropdown-icon.close {
 	animation-name: twentytwentyone-close-button-transition;
 	animation-duration: 0.3s;
 }