Hello, you can find the solution from the developer tools of the browser.
in iOS:
.item-ios{
color: black; //floating input label color
}
in android:
.item-input-has-focus .label-md[floating], .input-has-focus .label-md[floating]{
color: black; //label color when focusing
}
.item-input .label-md{
color: black; //label color
}