use body instead of classname, fix styling of the banner on invidious

src/youtube.ts

@@ -80,6 +80,7 @@ if (isYouTube) {
 const backgroundColor = isYouTube ? 'var(--yt-swatch-primary)' : '#fff';
 const buttonColor = isYouTube ? 'var(--yt-swatch-text)' : '#000';
 const textColor = isYouTube ? 'var(--yt-primary-text-color)' : '#000';
+const hostSize = isYouTube ? '1.4rem' : '0.9rem';
 
 const videoLink = (url, video) => htmlToElement(`
 <div id="${LINK_ID}"
@@ -131,7 +132,7 @@ const videoLink = (url, video) => htmlToElement(`
         ${video.name}
       </p>
 
-      <p style="font-size: 1.4rem; margin: 0;">
+      <p style="font-size: ${hostSize}; margin: 0;">
         ${video.account.host}
       </p>
     </div>