.cross::before { /* 十字カーソル */
	content: url('data:image/svg+xml;utf8,\
		<svg xmlns="http://www.w3.org/2000/svg" width="49" height="49" \
			viewBox="-24 -24 48 48" stroke="black" stroke-width="3">\
		<path d="M 6 0 h 18 M -6 0 h -18 M 0 6 v 18 M 0 -6 v -18 Z"/>\
		</svg>');
	position: absolute;
	top: calc(50% - 24px); left: calc(50% - 24px);
	opacity: 0.6;
	z-index: 490;
	pointer-events: none;
}