Contact form CSS (wpcf7)

hi, I just installed “Contact Form 7” plugin.
I created a form with several “inputs”.
I need to modify the css so that the text written inside the “input fields” is black, because now the color of the text is too light. Also, all fields are with a “yellow” border and I wish this border was gray.

I tried to modify the custom css like this:

.wpcf7 input {
color: #000000;
border: solid #d6d6d6;
}

So the text inside the “input” fields is not colored black … In short, it seems not to work.
Tips?

Thank you