.wp-embed-responsive {
    opacity: 1;
    transition: 1s opacity;
}
.fade-out {
    opacity: 0;
    transition: none;
}

.wp-embed-responsive {
	opacity: 1;
	animation-name: fadeInOpacity;
	animation-iteration-count: 1;
	animation-timing-function: ease-in;
	animation-duration: 0.25s;
}

@keyframes fadeInOpacity {
	0% {
		opacity: 0;
	}
	100% {
		opacity: 1;
	}
}