Columns not working

Columns are not working with vertical mega menu. The following css is overriding the 1/3 and 1/2 column widths:

#quadmenu.quadmenu-is-vertical:not(.quadmenu-is-horizontal) [class*=”col-“], #quadmenu.quadmenu-is-offcanvas:not(.quadmenu-is-horizontal) [class*=”col-“] {
max-width: 100%!important;
width: 100%!important;
float: none;
-webkit-flex: 0 0 100%;
-ms-flex: 0 0 100%;
flex: 0 0 100%;
padding-left: 0;
padding-right: 0;
}

How do I disable or override this CSS? Or, what settings to I need to adjust in the admin panel.

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