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Auto fit border to only below heading


I’m trying to have a yellow border show only below the subheading text in my “How It Works” section. My problem is that even when I set the width of my subheading to auto, the width goes well beyond the end of my text. When I then set the border, it is too long. How can I fix my width so it actually is auto and only fits in the content and no more?

Here’s my site:

Thanks so much for your help