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Hello @kristiaans
What template are you using on your form?
If you are using template 13, you can enter the style definition below through the “Customize Form Design” attribute in the “Form Settings” tab (https://resources.developers4web.com/cff/images/documentation/form-settings-tab.png):
#fbuilder .fields:not(.cff-switch-container) input[type="radio"]:checked::before{background:red !important;}The “Customize Form Design” attribute is a CSS editor with syntax highlighting and error checking.
Best regards.