I'm not really sure what this has to do with CFN, but it looks like your CSS isn't loading properly.
- Open the browser inspector and look at the path for the CSS file
- Try to open the CSS file in the browser
- When this fails, fix the problem until you can load the CSS in your browser
You are most likely loading some content over HTTPS and some over HTTP. The CSS is most likely not loading over HTTPS and your browser is blocking it. You will need to adjust Magento to load all content over HTTPS.
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