How to set radio buttons inline

Hello,
for a website using Hemmmingway-Theme I am crreating a form into a widget. Everything works fine, but there is only a problem with the radio buttons left: I can’t put them in one line, look at https://ruerup-basisrente.eu “Herr” and “Frau” should be in one line, but ther is “Frau” below “Herr”. I tried in css float:left and margin:0px orpadding:0px; or combinations of this, nothing works neither to set !important to make the setting sure. When I give the background a color to see the dimension of the element, the radio buttons are in the middle of a big space left and right. How cam I remove that big space?

Thnks

Ottilie