diff --git a/css/_single_theme.css.php b/css/_single_theme.css.php
index 8d2d8f3051..8d520cfb5c 100644
--- a/css/_single_theme.css.php
+++ b/css/_single_theme.css.php
@@ -314,6 +314,12 @@
 		<?php if ( $submit_width !== 'auto' ) { ?>
 			max-width:var(--submit-width)<?php echo esc_html( $important ); ?>;
 		<?php } ?>
+}
+.<?php echo esc_html( $style_class ); ?> input[type=submit][disabled],
+.<?php echo esc_html( $style_class ); ?> .frm_submit input[type=button][disabled],
+.<?php echo esc_html( $style_class ); ?> .frm_submit button[disabled] {
+	opacity: 0.5;
+	cursor: not-allowed;
 }
 		<?php
 	}//end if