Hi @wenlu
Good day to you and hope you are doing great.
The white background behind the share button is the navigate to top button within your website. Can you please increase the share button px from bottom to move the share button a bit more upper position. For that, go to Super Web Share > Floating > Position from Bottom increase the value to 10px. The issue will mostly get resolved and the navigate to top button will also be visible on this case.
Looking forward to hearing from you.
Kind regards
