Contact Form 7 plugin uses only very minimal CSS styling to allow CF7 forms to blend in with most websites. The appearance of CF7 forms depends primarily on the CSS styles set by the current WordPress theme.
?It’s an approach that in makes sense IMHO given the vast range of WordPress themes that CF7 is used with every day.
Whether your CF7 forms are responsive will depend largely on the current WordPress theme used and the CSS styling that theme applies to standard HTML form elements.?
Unfortunately many WP themes do not make any attempt to standard HTML form elements, let alone do it responsively.
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To change the style of your CF7 forms you would need to edit the CSS style sheets used by your WordPress theme.
See Styling Contact Form for a general explanation of styling CF7 forms using CSS.
There is a link at the bottom of the page to a comprehensive and detailed article on Styling Contact Form 7 Forms. The article shows people, with suitable HTML & CSS skills, how to change the appearance of their Contact Form 7 Forms to meet their particular requirements.
