Contact Form 7 Style的作者是Johnny, dorumarginean, mlehelsz, MirceaR,目前有50,000+个有效安装。已经Tested with 5.0.9版本的wordpress。
Contact Form 7 Style plugin is an addon for Contact Form 7 which needs to be installed on your WordPress website.

This plugin requires the Contact Form 7 plugin
Downloads history can be checked out on the website.

Supports custom styling, which can be easily managed via admin dashboard. Also has predefined templates like Simple Pattern, Valentine’s Day, Christmas that can be activated on your Contact Form 7.
Custom style options:
– color styling,
– custom fonts ( google fonts included ),
– styling for input fields, text, textarea, labels, submit button, messages, placeholders,
– border-color,
– form background-color,
– form transparent background-color,
– form background-image,
– form container styling,
– form container background-image styling,
– form placeholder opacity styling,
– customized style can be imported / exported
– quick edit option
– support multiple forms with different design
– Style Template Slider on the Contact Form 7 form Settings page
– px,em, % unit selector for all the specified style settings
– possibility to change the syling for the HOVER state of each element
– live preview on changing/adding the new style properties of each element
– possibility to customize error messages, success messages and warning messages
– setting page, where can re-import deleted default templates, deactivate collecting data and / or manipulate the appearance of the “edit style” button on the page where you have your contact form 7 form
Support can be found here.
or you can check the FAQ section.