Using Spoiler Shortcode with a fixed header background theme

I have a new website I’m working on which is on maintenance mode but I can provide the link to the theme I’m using if that will help. My theme uses a fixed header background. I’m trying to find out if there’s a way to stop the page from jumping up when opening the text within the spoiler shortcode? I wonder if my site visitors will be confused of what happened to the text when opening the spoiler text because the page seems to go up and the text isn’t immediately onscreen. In order to see the text, you have to scroll down. I use the spoiler shortcode on another site and it doesn’t do that so I’m realizing it must be my theme and the fact it has a fixed header background. What are my options on changing the way the text opens? Is there a way to expand onscreen instead of disappearing downward and forcing me to scroll down to view the spoiler text? I tried to include the accordion shortcode to wrap multiple spoilers to see if that will help but it doesn’t.