Thank you for your help. I am sorry, but I had already switched to another theme and done a lot of customization. I am afraid I will lose my work if I revert to your theme. Hopefully I will get to use VW Corporate Business for a future website.
I figured it out:
#custom-header::after {opacity: 0;}
Great theme! Thanks!
Darn. I really liked your theme, but it looks bad when I add white space below my logo to make it a square. I had to change to a different theme that allows rectangular logos.