body {
	--ball-dia: 100px;
}

.mode {
	position: absolute;
	left: 0;
	top: 0;
	width: 100vw;
	height: 100vh;

	mix-blend-mode: multiply;
}

.mask {
	background-color: black;
	color: white;
	font-size: 15vw;
	font-weight: 900;
	text-align: center;
	line-height: 100vh;
	z-index: 15;
	-moz-user-select: none;
	/*火狐*/
	-webkit-user-select: none;
	/*webkit浏览器*/
	-ms-user-select: none;
	/*IE10*/
	-khtml-user-select: none;
	/*早期浏览器*/
	user-select: none;
}

#app {
	position: absolute;
	left: 0;
	top: 0;
	z-index: 5;
}