Hi @9198459056,
the only way is to work with the CSS and I don't know how to help you.!
If the problem, using an empty panel is that you want less space between two panels than 1/3, you could modify the width of panels using a JS as described in the Splunk Dashboard Examples App (https://splunkbase.splunk.com/app/1603/) in the "Layout Customization: Panel Width".
Ciao.
Giuseppe