Mystile full length body

Hi Guys,

I’m customizing with Mystile theme.
I wanted to have a full width body whereby the horizontal green and white line background can take out the entire width.
Currently it is only taking out like 70%.

How can i make the width goes 100% from https://testinmint.tommyloh.com/?post_type=product to like https://loveinmint.tommyloh.com/

Thanks.