body {
	font-family: sans-serif;
	/* background-color: rgb(237, 178, 42); */
	background-image: linear-gradient(rgb(244, 183, 61), rgb(255, 216, 79));
}

table {
	margin: 0px auto;
}
h1 {
	text-align: center;
}

td.el_cell {
	border: 1px solid black;
	min-width: 4.5em;
}

div.el_sym {
	font-size: 3em;
	text-align: center;
}

div.el_name {
	text-align: center;
}

div.el_mass {
	float: right;
	display: inline;
}

div.el_num {
	display: inline;
}

td.el_hidden {
	display: none;
}