/* -------------------- */
/* 全体レイアウト */

	#header {

		position: relative;

		margin : 1em;
		padding: 1em;

		width: 200px;

		background: rgba(0, 0, 0, 0.5);
		border-radius: 0.5em;

	}

	#mainbox {

		position: fixed;

		left: 0px;
		top : 0px;

		width : 100%;
		height: 100%;

	}

/* -------------------- */
/* パーティクル */

	.particle {

		position: absolute;
		width: 50px;
		height: 50px;
		margin-left: -25px;
		margin-top : -25px;
		
		background-repeat: no-repeat;
		background-image: url("light.png");
		background-size: contain;

		mix-blend-mode: color-dodge;

	}