diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index 5109c7845c..5918954af5 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -3080,6 +3080,7 @@ img {
 	font-size: 13px;
 	background: #f9f9f9;
 	-moz-tab-size: 4;
+	-o-tab-size: 4;
 	tab-size: 4;
 }
 
diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index 36fd31ec02..90581822c3 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -1584,6 +1584,7 @@ p.customize-section-description {
 	font-size: 12px;
 	padding: 6px 8px;
 	-moz-tab-size: 2;
+	-o-tab-size: 2;
 	tab-size: 2;
 }
 .customize-control-code_editor textarea,
diff --git a/src/wp-admin/css/forms.css b/src/wp-admin/css/forms.css
index fc3863ef2f..1e39114172 100644
--- a/src/wp-admin/css/forms.css
+++ b/src/wp-admin/css/forms.css
@@ -315,6 +315,7 @@ input[type="radio"].disabled:checked:before {
 	border-radius: 3px;
 	padding: 3px 24px 3px 8px;
 	min-height: 28px;
+	max-width: 25rem;
 	vertical-align: middle;
 	-webkit-appearance: none;
 	/* The SVG is arrow-down-alt2 from Dashicons. */