plate-tool/src/components/plate.css

table, tr, td {
	box-sizing: border-box;
	user-select: none; /* Prevents dragging issue */
	border-spacing: 0px;
}
td.plate_cell {
	width: 30px;
	height: 30px;
	background: none;
}

div.plate_cell_inner {
	width: 90%;
	height: 90%;
	border-radius: 50%;
	border: 2px solid black;
}
td.plate_cell:hover div.plate_cell_inner {
	background: black !important;
}

td.current_select div.plate_cell_inner {
	background: lightblue !important;
}