diff --git a/themes/Legacy/5ePHB/style.less b/themes/Legacy/5ePHB/style.less
index 0123cde98..2793958fe 100644
--- a/themes/Legacy/5ePHB/style.less
+++ b/themes/Legacy/5ePHB/style.less
@@ -58,6 +58,7 @@ body {
 	text-rendering    : optimizeLegibility;
 	page-break-before : always;
 	page-break-after  : always;
+	contain           : size;
 	//*****************************
 	// *            BASE
 	// *****************************/
diff --git a/themes/V3/Blank/style.less b/themes/V3/Blank/style.less
index 1c7672842..985a34528 100644
--- a/themes/V3/Blank/style.less
+++ b/themes/V3/Blank/style.less
@@ -39,6 +39,7 @@ body {
 	text-rendering    : optimizeLegibility;
 	page-break-before : always;
 	page-break-after  : always;
+	contain           : size;
 }
 	//*****************************
 	// *            BASE