select2/themes/learn2/scss/theme/_tables.scss

table {
	border: 1px solid lighten($core-border-color,5%);
    table-layout: auto;
}

th {
	@extend strong;
	background: lighten($core-border-color,10%);
	padding: 0.5rem;
}

td {
	padding: 0.5rem;
	border: 1px solid lighten($core-border-color,5%);
}