Tweaking and Customizing Web Site

I started with carter lake templates when I started with WD as I was using VWS before but it crashed all the time in Win 10 and I needed the codes. I prefer white background and html5 so eventually I rewote the html and a global css sheet. Last thing left that isn’t html5 compliant is Marque. I have learned to animate text but not how to control where it displays like Marquee, it scrolls beyond the width of the page