ion toast change button color
// use Shadow Parts
// https://ionicframework.com/docs/api/toast#css-shadow-parts
ion-toast::part(button) {
color: black;
background: red;
border-radius: 14px;
}
button: Any button element that is displayed inside of the toast.
container: The element that wraps all child elements.
header: The header text of the toast.
message: The body text of the toast.