<===> input.scss
.one-screen-page {
	@extend %context-dark;
}

%context-dark {
	.button-secondary-outline {
		&:hover,
		&:focus,
		&:active,
		&:hover {
			color: #fca;
		}
	}
}

<===> output.css
.one-screen-page .button-secondary-outline:hover, .one-screen-page .button-secondary-outline:focus, .one-screen-page .button-secondary-outline:active {
  color: #fca;
}