At the sg-site-header-1 I found a H1 with an A tag in it, this thing causes the horizontal scroll-bar, why should you make a color #blank? This is not working, then make is display: invisible or something like that. Hopefully this will work for you!
@dutchsociety Thanks A Lot, you saved me, If you have time can you tell me how did you find out the solution to the problem, so I can do it by myself..
I opened my element inspector in Google Chrome and deleting sections of the website. So on that moment I deleted the header and saw that there was the long sized H1.
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solved Css overflow-y: hidden not working with inline elements