.p-mega-menu-container {
    position: relative;
}
.p-mega-menu-content {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.3);
    display: none;
    left: 0px;
    margin-top: -1px;
    position: absolute;
    top: 100%;
    width: 100%;
    z-index: 9999;
}
.p-mega-menu-trigger:hover .p-mega-menu-content {
    display: block;
}