From 935574abdd21723c0dd60cf177b54c9c31cac1fe Mon Sep 17 00:00:00 2001
From: Aaron Robertshaw <60436221+aaronrobertshaw@users.noreply.github.com>
Date: Fri, 1 Apr 2022 15:48:36 +1000
Subject: [PATCH] Attempt to clear border support styles on mobile

---
 packages/block-library/src/columns/style.scss | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/packages/block-library/src/columns/style.scss b/packages/block-library/src/columns/style.scss
index eb7e7d18072044..1b1430eb863180 100644
--- a/packages/block-library/src/columns/style.scss
+++ b/packages/block-library/src/columns/style.scss
@@ -71,6 +71,20 @@
 			}
 		}
 	}
+
+	&:where(:not(.is-not-stacked-on-mobile)) {
+		@media (max-width: #{ ($break-medium - 1) }) {
+			& > .wp-block-column[class*="has-border-"], // Clear when color defined.
+			& > .wp-block-column[style*="border-style"], // Clear when border style set.
+			& > .wp-block-column[style*="border-width"],
+			& > .wp-block-column[style*="border-top-width"],
+			& > .wp-block-column[style*="border-right-width"],
+			& > .wp-block-column[style*="border-bottom-width"],
+			& > .wp-block-column[style*="border-left-width"] {
+				border-width: 0 !important;
+			}
+		}
+	}
 }
 
 // Add low specificity default padding to columns blocks with backgrounds.