Get rid of borders of drop down menu (folders) in navigation bar

Site URL: https://www.edenroseextensions.co.uk

Hey, when I click on the drop down menu of the Prices folder in the navigation bar, it comes up with a pink border. How do i remove the pink border without removing the pink lines on the pages in my website? And how do i make changes to the style and colours of the drop down folders? Thanks, Lucy

Add to Home > design > Custom CSS

.subnav ul {
    border: none !important;
}