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If you want to add inline styles for an XForm form element using the XForm editor, you might be able to modify how the XForm is rendered to treat the CSS class field in a different way. Honestly though, for EPiServer 6 R2, this is not going to be the "easy way", nor would it be the best decision in general.
If you want an "easy way", you're really better off just modifying your CSS file.
I would like to increase the width of the first column in a form. Cant find a good style for this in the css-file today and I dont want to change the file. Is it possible to write html or css code directly in the css style field for the heading properies?
Or is there any other easy way?