Hi @Mariekaf,
The QR card does not seem centered in the page. I suggest you have a look at CSS Flexbox, which provides a neat way to do such centering (both horizontally and vertically). CSS-tricks.
I also notice that the typeface does not correspond to the one in the solution. In the CSS property font-family, you specify the Google link to the typeface as a value, but I assume this value cannot be correctly interpreted and the browser falls back to a default type.
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