davmerit

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.

This is not available directly in Contact Form 7. It can be done via custom programing but you would need to be rather skilled at WordPress development using PHP and/or jQuery.

Some of the premium Form plugins do offer some Conditional Logic including Gravity Forms and Ninja Forms.

Also see https://wordpress.org/support/topic/plugin-contact-form-7-this-is-how-to-showhide-fields-with-jquery
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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.

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, 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.

To make your form responsive you need to provide responsive CSS styling to the relevant standard HTML form elements, if your theme doesn’t do this.

For basic responsive resizing you can start with something like:

.wpcf7-form {
       width: 100%;
}

.wpcf7-form input,
.wpcf7-form input[type="text"],
.wpcf7-form input[type="email"],
.wpcf7-form input[type="tel"],
.wpcf7-form textarea, {
    width: 100%;
}

​Add your CSS via Child Theme or use custom CSS plugin.

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. There is a link at the bottom of the page to 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.

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.

I think the first answer on the thread would help. But once again you need to be skilled at WordPress development using jQuery to be able to do this.

see Contact Form 7 Email Issues – there is a link there that covers JavaScript Conflicts.