diff --git a/mapper/src/App.css b/mapper/src/App.css
index 44dcf4e..c64c6c8 100644
--- a/mapper/src/App.css
+++ b/mapper/src/App.css
@@ -140,6 +140,11 @@ h2 {
 	place-content: center;
 }
 
+/* Fix for Firefox Mobile rendering a black background on checked state */
+.submenu-checkbox-label input[type="checkbox"]:checked {
+	background-color: transparent;
+}
+
 .submenu-checkbox-label input[type="checkbox"]::before {
 	content: "";
 	width: 0.75em;