diff --git a/src/_Grid.sass b/src/_Grid.sass
index 83cca78..6609e62 100644
--- a/src/_Grid.sass
+++ b/src/_Grid.sass
@@ -151,7 +151,7 @@
 			align-self: center
 
 // Larger than mobile screen
-@media (min-width: 640px)
+@media (min-width: 40rem) // Safari desktop has a bug using `rem`, but Safari mobile works
 
 	.row
 		flex-direction: row
diff --git a/src/_Typography.sass b/src/_Typography.sass
index 61e43e4..f66427e 100644
--- a/src/_Typography.sass
+++ b/src/_Typography.sass
@@ -46,7 +46,7 @@ h6
 	line-height: 1.4
 
 // Larger than mobile screen
-@media (min-width: 640px)
+@media (min-width: 40rem) // Safari desktop has a bug using `rem`, but Safari mobile works
 
 	h1
 		font-size: 5.0rem