Full width pages to Venue -theme

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Hi Friends,
I need a help with Venue theme and it's "/pages".
I'm currently doing a page (/page) and I noticed that I cannot make the "banner image" full width. I have tested both template suffix: page.sections-1 and page.full-width. Added a screenshot:

The banner image always covers about 90% of the page's width >> I have also tried to add html & css to:

.full-width {
  width: 100%;

It's still not 100% width. Do you know how I can make the image full width - like it is for example in homepage's image (e.g. slideshow)
How can I add an image which is 100% full width? 

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