web/src-web/src/theme/theme-base/components/menu/_panelmenu.scss
.p-panelmenu {
    .p-panelmenu-header {
        > a {
            padding: $accordionHeaderPadding;
            border: $accordionHeaderBorder;
            color: $accordionHeaderTextColor;
            background: $accordionHeaderBg;
            font-weight: $accordionHeaderFontWeight;
            border-radius: $borderRadius;
            transition: $listItemTransition;

            .p-panelmenu-icon {
                margin-right: $inlineSpacing;
            }

            .p-menuitem-icon {
                margin-right: $inlineSpacing;
            }

            &:focus {
                @include focused();
            }
        }

        &:not(.p-highlight):not(.p-disabled) {
            > a:hover {
                background: $accordionHeaderHoverBg;
                border-color: $accordionHeaderHoverBorderColor;
                color: $accordionHeaderTextHoverColor;
            }
        }

        &.p-highlight {
            margin-bottom: 0;

            > a {
                background: $accordionHeaderActiveBg;
                border-color: $accordionHeaderActiveBorderColor;
                color: $accordionHeaderTextActiveColor;
                border-bottom-right-radius: 0;
                border-bottom-left-radius: 0;
            }

            &:not(.p-disabled) {
                > a {
                    &:hover {
                        border-color: $accordionHeaderActiveHoverBorderColor;
                        background: $accordionHeaderActiveHoverBg;
                        color: $accordionHeaderTextActiveHoverColor;
                    }
                }
            }
        }
    }

    .p-panelmenu-content {
        padding: $verticalMenuPadding;
        border: $accordionContentBorder;
        background: $accordionContentBg;
        color: $accordionContentTextColor;
        border-top: 0;
        border-top-right-radius: 0;
        border-top-left-radius: 0;
        border-bottom-right-radius: $borderRadius;
        border-bottom-left-radius: $borderRadius;

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

                .p-panelmenu-icon {
                    margin-right: $inlineSpacing;
                }
            }
        }

        .p-submenu-list:not(.p-panelmenu-root-submenu) {
            padding: $treeNodeChildrenPadding;
        }
    }

    .p-panelmenu-panel {
        margin-bottom: $accordionSpacing;

        @if $accordionSpacing == 0 {
            .p-panelmenu-header {
                > a {
                    border-radius: 0;
                }
            }

            .p-panelmenu-content {
                border-radius: 0;
            }

            &:not(:first-child) {
                .p-panelmenu-header {
                    > a {
                        border-top: 0 none;
                    }

                    &:not(.p-highlight):not(.p-disabled):hover,
                    &:not(.p-disabled).p-highlight:hover {
                        > a {
                            border-top: 0 none;
                        }
                    }
                }
            }

            &:first-child {
                .p-panelmenu-header {
                    > a {
                        border-top-right-radius: $borderRadius;
                        border-top-left-radius: $borderRadius;
                    }
                }
            }

            &:last-child {
                .p-panelmenu-header:not(.p-highlight) {
                    > a {
                        border-bottom-right-radius: $borderRadius;
                        border-bottom-left-radius: $borderRadius;
                    }
                }

                .p-panelmenu-content {
                    border-bottom-right-radius: $borderRadius;
                    border-bottom-left-radius: $borderRadius;
                }
            }
        } 
    }

}
