Hello,
Please see screenshot https://prnt.sc/ixvdhh
add this code:
.wpb_revslider_element {
margin-bottom: 0px;
}
in custom css for the page http://prntscr.com/ixvdy5
To access the DevTools, open a web page or web app in Google Chrome https://developers.google.com/web/tools/chrome-devtools/inspect-styles/. Either:
-Select the Chrome menu Chrome Menu at the top-right of your browser window, then select Tools > Developer Tools.
-Right-click on any page element and select Inspect Element.
The DevTools window will open at the bottom of your Chrome browser.
Regards