Why is there unexpected blank space on the side of my webpage?

[johnmos]

It feels like a section is wider than the rest and makes my whole website wider than expected.
Can't see anything unusual but I would appreciate it if someone could have a look.
It's even worse one smartphones.
Here is my website John Wireless Tyre Inflator V3 Digital Air Pump 150PSI 6000mAh (mosperformance.co.uk)
and a screenshot of what I mean (on the right)

[ThePrimeWeb · Accepted solution]

Hey @johnmos,

Did you try hiding the sections in the Theme Customizer to see who the culprit can be?

[johnmos]

Good shout! Found it straight away it was the header!
To be more specific if anyone ever needs it, I had to change the cart type from pop notification to drawer
Thank you for your help!