html, body {
	margin:  0;
	width:   100%;
	height:  100%;

	background-color: #4f8090;
	overflow: hidden;
}

#yam {
	position:    absolute;
	margin:      0;
	top:         calc(50% - 125px);
	left:        calc(50% - 125px);
	width:       250px;
	height:      250px;
	font-size:   200px;
	line-height: 250px;
	text-align:  center;

	cursor:           pointer;
	-moz-user-select: none;
    user-select:      none;

    will-change: top, left;
}