I just needed to say this here. Make sure to read everything on this site as it is ALL greatly helpful. If I had I wouldn’t have been stuck on Step 13 from the very first module: Build a Cat Photo App.
It states thar if you are using a dark reader from like Google Chrome store…this can affect how things operate or on the flip side…won’t function at all…I knew i had the code right but the dark reader was messing with when I’d go to submit my code…Thought maybe someone would find this helpful. 
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