Fix underline color for tooltip

index.html

@@ -114,7 +114,7 @@ <h1 class="hero__content__name">Lawnchair</h1>
         <h2 class="about__header">No clever tagline needed</h2>
         <div class="about__description">
           Yup. Get it?
-          <span title="A pun of the word 'Launcher', if you didn't get it..." style="border-bottom: 1px dotted var(--text-color);">Lawnchair</span>. It's a bad pun, we know.
+          <span title="A pun of the word 'Launcher', if you didn't get it..." style="border-bottom: 1px dotted var(--on-surface);">Lawnchair</span>. It's a bad pun, we know.
           Lawnchair is a supercharged version of
           the Pixel Launcher you know and love. Being an open-source project,
           you get all the latest Pixel Launcher features shipped by Google in