Problem with "back" button

your theme is probably styling your button to not look like a button.

Ok, but “next” button works normally. Back” button is not reacting my pushing. Its looks like a text on a page. Maybe problems in code?

you can see a working version here:
https://webheadcoder.com/contact-form-7-multi-step-form/

It’s possible that your theme or another plugin might be affecting the back button. The back button has a “wpcf7-back” class which may be styled differently.

Maybe you can try placing the back button at the top of your form to see if that changes anything. Or remove it and see if the Next button gets affected.

The “next” button works well with or without “back” button. But I think problem in a css of cf7. This how its looks like https://i017.radikal.ru/1512/41/5bc43cbfbc31.png . How can you see the “back” button is not active as like “next” button.

I see. You’ll have to style the Back button similar to how your theme styles your next button. Neither Contact Form 7 nor the multi-step plugin defines how the next or back buttons look. Your theme defines a style for input[type=”submit”]. You’ll need to add a specific style rule for input[type=”button”] or input.wpcf7-back so the back button looks like your next button.

What I suppose to do? What type code I need to?

You can inspect the Next button’s styles. Similar to how you did for the back button.

When you find the Next button’s styles, copy it and paste it in the code below where it says “<paste styles here>”.

Open your theme’s style.css file and add the following:

.wpcf7-back {
<paste styles here>
}