Override browser form-filling and input highlighting with HTML/CSS

Question

I have 2 basic forms: sign in and sign up, both on the same page. Now, I have no problem with the sign in form auto-filling, but the sign up form auto fills as well, and I don't like it.

Also, the form styles get a yellow background which I can't manage to override and I don't want to use inline CSS to do so. What can I do to make them stop being colored yellow and (possibly) auto filling?

Answer 1

Trick it with a "strong" inside shadow:

input:-webkit-autofill {
    -webkit-box-shadow:0 0 0 50px white inset; /* Change the color to your own background color */
    -webkit-text-fill-color: #333;
}

input:-webkit-autofill:focus {
    -webkit-box-shadow: 0 0 0 50px white inset;/*your box-shadow*/
    -webkit-text-fill-color: #333;
}