ionic-framework/scss/framework/theme/default/_button.scss

.button {
	color: $buttonColor;
	border-radius: $buttonBorderRadius;
	padding: $buttonPadding;
}

.button-default {
	background-color: $buttonDefaultBackground;
	border: $buttonBorderWidth solid $buttonDefaultBorder;

	&:active {
		background-color: $buttonDefaultBackgroundActive;
	}
}