slider-pro-js/src/add-ons/fullscreen/fullscreen.css

Modular JavaScript slider that is dependency-free, rich-featured, flexible and easy to use

.sp-fullscreen {
	margin: 0 !important;
	background-color: #000;
}

.sp-fullscreen-button {
	position: absolute;
	top: 5px;
	right: 10px;
	font-size: 30px;
	line-height: 1;
	cursor: pointer;
	transform: rotate(45deg);
}

.sp-fullscreen-button::before {
	content: "\2195";
}

.sp-fade-fullscreen {
	opacity: 0;
	transition: opacity 0.5s;
}

.slider-pro:hover .sp-fade-fullscreen {
	opacity: 1;
}