diff --git a/assets/scss/shared-ui/_modals.scss b/assets/scss/shared-ui/_modals.scss
index 24a111d2..c9bf95e7 100644
--- a/assets/scss/shared-ui/_modals.scss
+++ b/assets/scss/shared-ui/_modals.scss
@@ -23,7 +23,7 @@
 
 		// ELEMENT: Overlay mask.
 		.sui-modal-overlay {
-			width: calc(100% - #{map-get($wordpress, adminmenu)});
+			width: calc(100% - #{map-get($wordpress, adminmenu)} - #{($browser-scrollbar-width)});
 			height: calc(100vh - #{map-get($wordpress, adminbar)});
 			position: fixed;
 			z-index: #{map-get($modal, z-index) - 1};
diff --git a/assets/scss/shared-ui/_variables.scss b/assets/scss/shared-ui/_variables.scss
index bd0191ae..399bef26 100644
--- a/assets/scss/shared-ui/_variables.scss
+++ b/assets/scss/shared-ui/_variables.scss
@@ -288,6 +288,8 @@ $onboard: (
 	button-md: 30px,
 ) !default;
 
+$browser-scrollbar-width: 17px !default;
+
 // ============================================================
 // Toggles (_toggles.scss)