m 0.18s ease; font-size: 14px; vertical-align: middle; } /* submenu hidden by default */ .pc-sidebar .pc-submenu { display: none; } /* show submenu when parent has .open */ .pc-sidebar .pc-hasmenu.open > .pc-submenu { display: block; } /* rotate arrow when open: chevron-up (0deg) -> chevron-down after rotate(180deg) */ .pc-sidebar .pc-hasmenu.open > .pc-link .pc-arrow .pc-arrow-icon { transform: rotate(180deg); } /* optional: adjust spacing of arrow */ .pc-sidebar .pc-link .pc-arrow { margin-left: auto; display: inline-flex; align-items: center; }