The images are in .svg format and if you correctly link the path to the files it will have no problems displaying on your site. You do not need to convert.
for the illustration-hero, your img source would be
Learn about positioning background with css to get the background in the right position.
Also in the future, It’s best practice making a separate css file for your styles so your index.html isn’t so cluttered. Stay away from in-line styles.
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@lmaoken Thank you for the feedback Ken, especially where the image issue is concerned. Next time I'll definitely use a separate style sheet instead of coding in the page itself.