There is a CSS rule on your page that does that. The rule is below
.pmpro_content_message {padding-top:20vw;padding-right:24px !important;}
So the first question is where does this rule come from?
Did you add it, if so just remove the padding-top property.
.pmpro_content_message {padding-right:24px !important;}
If you did not add it, then are you using a plugin for that content, and if so, there is likely a setting in the plugin generating that rule.
If you can locate any of that, you can add the rule below to the Theme Global Custom CSS Rule box to override it
.pmpro_content_message {padding-top:0px !important;}