Add a colored border around the highlighted Advanced Levels Compare table column

pmpro_advanced_levels-compare_table.css

/* Advanced Levels Compare table - add border to highlighted column */
.pmpro_advanced_levels-compare_table thead th.pmpro_level-highlight, 
.pmpro_advanced_levels-compare_table tbody td.pmpro_level-highlight, 
.pmpro_advanced_levels-compare_table tfoot td.pmpro_level-highlight {
	border-left: 6px solid #00d084;
	border-right: 6px solid #00d084;
}

#pmpro_levels.pmpro_advanced_levels-compare_table tfoot tr:last-child td.pmpro_level-highlight {
	border-bottom: 6px solid #00d084;
}

#pmpro_levels.pmpro_advanced_levels-compare_table thead tr:first-child th.pmpro_level-highlight {
	border-top: 6px solid #00d084;
}