* {
	padding: 0;
	margin: 0;
	box-sizing: border-box;
}
body {
	background-color: lightgrey;
	padding: 1em;
}
.graphxy {
	position: relative;
	outline: 2px solid cornflowerblue;
	width: calc(100vw - 2.1em);
	height: calc(100vh - 2.1em);
}
canvas {
	background-color: gainsboro;
	height: 100%;
	width: 100%;
}
#info-panel {
	position: absolute;
	top: 10px;
	left: 10px;
	background: rgba(0,0,0,0.6);
	color: #eee;
	font-family: monospace;
	font-size: 12px;
	line-height: 1.4;
	padding: 8px;
	border-radius: 4px;
	pointer-events: none; /* pour cliquer à travers */
	z-index: 1000;
}
#info-panel div {
	margin-bottom: 2px;
}