web/src-web/src/theme/theme-base/components/menu/_megamenu.scss
.p-megamenu {
    padding: $horizontalMenuPadding;
    background: $horizontalMenuBg;
    color: $horizontalMenuTextColor;
    border: $horizontalMenuBorder;
    border-radius: $borderRadius;

    .p-megamenu-root-list {  
        > .p-menuitem {
            > .p-menuitem-link {
                @include horizontal-rootmenuitem-link();
            }

            &.p-menuitem-active {
                > .p-menuitem-link,
                > .p-menuitem-link:not(.p-disabled):hover {
                    background: $horizontalMenuRootMenuitemActiveBg;
            
                    .p-menuitem-text {
                        color: $horizontalMenuRootMenuitemTextActiveColor;
                    }
            
                    .p-menuitem-icon {
                        color: $horizontalMenuRootMenuitemIconActiveColor;
                    }
                    
                    .p-submenu-icon {
                        color: $horizontalMenuRootMenuitemIconActiveColor;
                    }
                }
            }
        }
    }

    .p-menuitem-link {
        @include menuitem-link();
    }

    .p-megamenu-panel {
        background: $overlayMenuBg;
        color: $menuTextColor;
        border: $overlayMenuBorder;
        box-shadow: $overlayMenuShadow;
    }

    .p-megamenu-submenu-header {
        margin: $submenuHeaderMargin;
        padding: $submenuHeaderPadding;
        color: $submenuHeaderTextColor;
        background: $submenuHeaderBg;
        font-weight: $submenuHeaderFontWeight;
        border-top-right-radius: $borderRadius; 
        border-top-left-radius: $borderRadius; 
    }

    .p-megamenu-submenu {
        padding: $verticalMenuPadding;
        width: $menuWidth;

        .p-menu-separator {
            border-top: $divider;
            margin: $menuSeparatorMargin;
        }
    }

    .p-menuitem {
        &.p-menuitem-active {
            > .p-menuitem-link {
                background: $menuitemActiveBg;

                .p-menuitem-text {
                    color: $menuitemTextActiveColor;
                }

                .p-menuitem-icon, .p-submenu-icon {
                    color: $menuitemIconActiveColor;
                }
            }
        }
    }

    &.p-megamenu-vertical {
        width: $menuWidth;
        padding: $verticalMenuPadding;
    }

    .p-megamenu-button {
        width: $actionIconWidth;
        height: $actionIconHeight;
        color: $horizontalMenuRootMenuitemIconColor;
        border-radius: $actionIconBorderRadius;
        transition: $actionIconTransition;
    
        &:hover {
            color: $horizontalMenuRootMenuitemIconHoverColor;
            background: $horizontalMenuRootMenuitemHoverBg;
        }
    
        &:focus {
            @include focused();
        }
    }

    .p-submenu-icon {
        transition: transform $transitionDuration;
    }

    &.p-megamenu-mobile-active {
        .p-megamenu-root-list {
            padding: $verticalMenuPadding;
            background: $overlayMenuBg;
            border: $overlayMenuBorder;
            box-shadow: $overlayMenuShadow;

            .p-menu-separator {
                border-top: $divider;
                margin: $menuSeparatorMargin;
            }

            .p-submenu-icon {
                font-size: $menuitemSubmenuIconFontSize;

                &.p-icon {
                    width: $menuitemSubmenuIconFontSize;
                    height: $menuitemSubmenuIconFontSize; 
                }
            }

            > .p-menuitem {
                width: 100%;
                position: static;

                > .p-menuitem-link {
                    @include menuitem-link();

                    > .p-submenu-icon {
                        margin-left: auto;
                    }
                }

                &.p-menuitem-active {
                    > .p-menuitem-link {
                        > .p-submenu-icon {
                            transform: rotate(-180deg);
                        }
                    }
                }
            }

            .p-submenu-list {
                width: 100%;
                position: static;
                box-shadow: none;
                border: 0 none;

                .p-submenu-icon {
                    transition: transform $transitionDuration;
                    transform: rotate(90deg);
                }

                .p-menuitem-active {
                    > .p-menuitem-link {
                        > .p-submenu-icon {
                            transform: rotate(-90deg);
                        }
                    }
                }
            }

            .p-menuitem {
                width: 100%;
                position: static;
            }
        }
    }
}
