Hi there!
Thanks for contacting us!
Did you mean the following space?
https://prnt.sc/zrlayx
Then you can use the following code in your custom css:
#sp-right .sp-module {
margin-top: 0px!important;
}
Note: Path towards custom CSS:
Extensions>Templates>Styles>
Click on your current default template name then choose Template Options.
Then find custom CSS within the custom code.
https://prnt.sc/pu705g
https://prnt.sc/pu70zn
The following blog post may help you:
https://www.joomshaper.com/blog/which-line-of-css-i-have-to-edit-code-inspector-in-action
Best Regards