@HeewonSeo1
Posted
Hey! I hope this feedback is helpful.
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As for your css not loading, it seems like when you hosted the site, your css file wasn't linked properly or you forgot to include it. Maybe check the files you uploaded when you were hosting? The css seems to load fine on my side.
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If you want to vertically and horizontally align the card to the center of your page you could make the body tag a flex or grid element and use place-content: center, or justify-content/align-items.
This is a pretty good flexbox video: https://www.youtube.com/watch?v=phWxA89Dy94