.sparkles {
	position: absolute;
	bottom: 0;
	height: 100vh;
	width: 100%;
	z-index: 2;
}
.sparkle {
	position: absolute;
	bottom: 10px;
	left: 10px;
	display: block;
	height: 100px;
	width: 100px;
	background-image: url(../img/sparkle.png); /* 適宜パスを調整 */
	background-repeat: no-repeat;
	background-position: center;
	background-size: 100% 100%;
	animation-name: sparkle;
	animation-duration: 4s;
	animation-timing-function: linear;
	animation-iteration-count: infinite;
	animation-fill-mode: forwards;
	opacity: 0;
}

.sparkle--small {
	height: 75px;
	width: 75px;
}

.sparkle--left {
	animation-name: sparkleLeft;
}

@keyframes sparkle {
	0% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
	3% {
		transform: scale(1) rotate(15deg);
		opacity: 1;
	}
	6% {
		transform: scale(1) rotate(15deg);
		opacity: 1;
	}
	9% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
	100% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
}

@keyframes sparkleLeft {
	0% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
	3% {
		transform: scale(1) rotate(-15deg);
		opacity: 1;
	}
	6% {
		transform: scale(1) rotate(-15deg);
		opacity: 1;
	}
	9% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
	100% {
		transform: scale(0) rotate(0deg);
		opacity: 1;
	}
}