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Please include a link to your Contact Form 7 form. If others here are able to understand your actual problem, they may be able and willing to offer a possible solution.

I can see exactly what needs to be changed, but if I enter that CSS into the ePanel, it is ignored.

You can use https://wordpress.org/plugins/simple-custom-css/​​ to add your CSS

Please include all your input in the Form of the CF7 interface.

How does that work? How did we go from .wpcf7 input[type=”text”]{} to .wpcf7-text {}?

These options depend largely on the CSS styling applied to the form elements of your theme. In general, .wpcf7-text{} is more appropriate as it targets all CF7 forms text fields, but then again, depending on your theme that might not work for you 🙂

​​So the best way is to use Firebug or Chrome Dev Tools to examine the HTML and CSS of your CF7 form in detail. Once you understand how the HTML and CSS is configured in your CF7 form, you should be able to see the CSS changes you need to change the appearance of the form to suit your requirements.​

​​​See Styling Contact Form for a general explanation of styling CF7 forms using CSS.

If you find you need more detailed advice, after reading and working through the above link, please include a link to your Contact Form 7 form, so others here can examine your form in detail using Firebug or Chrome Dev Tools to understand the CSS used for your CF7 form elements and provide you with a possible solution.

The actual look of CF7 forms on your website will depend largely on the current WordPress theme used and the CSS styling that theme applies to standard HTML form elements. 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.

Also see ​
Using a Custom CSS plugin to modify a CF7 Skins Style – provides step by step instructions on how to change Submit button styling.
Contact Form 7 Custom Button – shows to use an image as form button instead of the default submit button.

If you find you need more detailed advice, after reading and working through the above link, please include a link to your Contact Form 7 form, so others here can examine your form in detail using Firebug or Chrome Dev Tools to understand the CSS used for your CF7 form elements and provide you with a possible solution.

Though the plugin successfully sends millions of emails every day, there are a host of issues that can stop or delay emails on both the sending and receiving ends. It depends entirely on your local Server & WordPress configuration. You will need to investigate this issue for your particular local configuration.

See Contact Form 7 Email Issues. Has a comprehensive and detailed article which covers many issues. Most people that work through this information appear to be able to resolve their email sending & receiving issues.

Also see After submitting the form, I get an error message stating “Failed to send your message”. What is wrong?​​

If you find you need more detailed advice, after reading and working through the above links, please include a link to your Contact Form 7 form plus all your input in the Form and Mail sections of the CF7 interface. This should allow others to understand your actual problem and offer a possible solution.

See http://contactform7.com/custom-layout-for-checkboxes-and-radio-buttons/
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Also see Styling Contact Form for a general explanation of styling CF7 forms using CSS.

However, now my client wishes to have a smaller form on the homepage, which will have to have different styling. Is this possible?

YES! You can have several CF7 forms on one ​​website.

How can I assign styles to 2 different forms, if possible?

See Styling Contact Form for a general explanation of styling CF7 forms using CSS.

If you find you need more detailed advice, after reading and working through the above link, please include a link to your Contact Form 7 form, so others here can examine your form in detail using Firebug or Chrome Dev Tools to understand the CSS used for your CF7 form elements and provide you with a possible solution.