Test Automation Obstacle: Red stripe

Can you do this one?

Easy Click on the button labeled 'generate', and then click on the red stripe that appears. The number below the button informs you how far to the right from the edge of the screen stripe has appeared. The value is displayed as the percentage of the screen width.

I messed up - please let me try again.

Nah, that's too hard. Take me to the next one