CSS让视频，图片背景透明化

mix-blend-mode混合模式中有一种混合模式名为滤色，单词是screen，其有一个很有意思的特性表现，那就是黑色和其它元素进行混合的时候表现为透明。

<div class="figure">
	<img src="https://source.unsplash.com/VW8MUbHyxCU/1920x1080" alt="" class="image">
	<h1 class="text">Fade-in Texth1>
div>

.figure {
	position: relative;
	height: 100vh;
	overflow: hidden;
}

.image {
	position: absolute;
	width: 100%;
	height: 100%;
	object-fit: cover;
	z-index: -1;
	transform: scale(1.8);
	animation: scaleImage 5s ease-out forwards;
}

.text {
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100%;
	font-family: 'Roboto', Arial, sans-serif;
	font-size: calc(10px + 8vw);
	font-weight: 700;
	line-height: 1.2;
	letter-spacing: 0.05em;
	white-space: nowrap;
	text-transform: uppercase;
	color: #fff;
	background-color: #000;
	mix-blend-mode: multiply;
	opacity: 0;
	margin: 0;
	animation: fadeInText 3s 2s ease-out forwards;
}

@keyframes scaleImage {
	100% {
		transform: scale(1);
	}
}

@keyframes fadeInText {
	100% {
		opacity: 1;
	}
}

视频也是也可以直接设置，只要把我们的视频背景色设置为黑色，同时设置如下CSS即可：

video {
    mix-blend-mode: screen;
}