Answers for "ionic change input color"

ionic input line color

ion-item {
  --border-color: var(--ion-color-danger, #f1453d);
}

ion-input background color

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
input:-webkit-autofill:active {
    -webkit-box-shadow: 0 0 0 30px #cddc39 inset !important;
}
 
@-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;
}