Hello Ryan, welcome to the forum!
This is a know “ins” problem and i will help you to remove yellow background. To solve this go to Appearance → Customize → Additional CSS → Add the following code and Save:
ins { background-color: none; text-decoration: none; }
The first code remove completly the background and will use your color background I suggest you put the first one but if you want custom color like “Black” add the following CSS instead the first:
ins { background-color: #000; text-decoration: none; }
If your question is about only “the ads” background color go to your service ADS page and try to change it. Sometime service like google ads set automatically the background color of ads without you having control over them.
Let me know if there is something not clear
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