diff --git a/themes/V3/Blank/snippets/imageMask.gen.js b/themes/V3/Blank/snippets/imageMask.gen.js
index 6d5ac026b..9c2a35c2c 100644
--- a/themes/V3/Blank/snippets/imageMask.gen.js
+++ b/themes/V3/Blank/snippets/imageMask.gen.js
@@ -4,10 +4,11 @@ const dedent = require('dedent-tabs').default;
 module.exports = {
 	center :()=>{
 		return dedent`
-			{{imageMaskCenter${_.random(1, 10)},--offsetX:0cm,--offsetY:0cm,--rotation:0;
+			{{imageMaskCenter${_.random(1, 10)},--offsetX:0%,--offsetY:0%,--rotation:0;
 			  ![](https://i.imgur.com/GZfjDWV.png){height:100%}
 			}}
-			<!-- Use --offset to shift the mask toward or away from the page center.
+			<!-- Use --offsetX to shift the mask left or right (can use cm instead of %)
+			     Use --offsetY to shift the mask up or down
 			     Use --rotation to set rotation angle in degrees. -->\n\n`;
 	},
 
@@ -30,7 +31,7 @@ module.exports = {
 		const offsetX = (x == 'left' ? '-50%' : '50%');
 		const offsetY = (y == 'top'  ? '50%' : '-50%');
 		return dedent`
-			{{imageMaskCorner${_.random(1, 37)},--offsetX:${offsetX},--offsetY:${offsetY},--rotation:0deg
+			{{imageMaskCorner${_.random(1, 37)},--offsetX:${offsetX},--offsetY:${offsetY},--rotation:0
 			  ![](https://i.imgur.com/GZfjDWV.png){height:100%}
 			}}
 			<!-- Use --offsetX to shift the mask left or right (can use cm instead of %)