nav.menu-main-menu-container {
    position: fixed;
    width: 100vw;
    height: 100vh;
    background-color: white;
    display: flex;
    align-items: center;
    left: 100%;
    transition: .6s;
}

nav.menu-main-menu-container.open {
    left: 0;
    z-index: 999;
}

nav.menu-main-menu-container ul {
    display: flex;
    flex-direction: column;
    width: 100%;
    text-align: center;
}


@media only screen and (min-width: 768px) {
    nav.menu-main-menu-container {
        position: relative;
        width: auto;
        height: auto;
        background-color: transparent;
        left: auto;
    }

    nav.menu-main-menu-container ul {
        flex-direction: row;
        width: auto;
        text-align: left;
    }
}