That is happening because of text-decorations. If you want to modify just a single link, you can do it by adding the styling to the HTML for the link like so:
<A HREF="page.html" STYLE="text-decoration: none">Huh</a>
Otherwise if it's a global change, you'll need to update the css style, as shown here CSS text-decoration property
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if you need the text it to stay white, try using an !important declaration to override any other styling. Text-decoration will keep it from being underlined, but color is a different property. And remember, most email clients like Gmail, Yahoo, etc. prefer seeing in-line CSS... It's painstaking, but it will help ensure your emails look the same across a variety of clients.
For example, for the Learn More text inside this 100% CSS button we use looks like this:
<a style="text-decoration: none; color: #ffffff !important; font-size: 18px; font-family: Arial, Helvetica, sans-serif;" href="https://info.stanleycss.com/2015PerimeterSecurity.html">LEARN MORE</a>
Good catch, Joe.