Change ion-input underline color in Ionic 4

Question

How can we change the default underline color of a ion-text in only a single page in Ionic 4?

Answer 1

Ionic 4.x uses CSS Custom Properties for most of the time.

src/app/pages/test/test.page.scss

:host {
    ion-item {
        --border-color: white; // default underline color
        --highlight-color-invalid: red; // invalid underline color
        --highlight-color-valid: green; // valid underline color
    }
}

If necessary, please check the other custom properties here.

Answer 2

Try this css

.item-has-focus{
   --highlight-background: #e2e2e2;
}