Check out example codes for "css inputs outofill color". It will help you in understanding the concepts better.

Code Example 1

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
input:-webkit-autofill:active  {
  -webkit-box-shadow: 0 0 0 30px white inset !important;
}

Code Example 2

@-webkit-keyframes autofill {
    0%,100% {
        color: #666;
        background: transparent;
    }
}

input:-webkit-autofill {
    -webkit-animation-delay: 1s; /* Safari support - any positive time runs instantly */
    -webkit-animation-name: autofill;
    -webkit-animation-fill-mode: both;
}

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