.mobile-navigation {
    top: 45px;
    left: 0;
    line-height: 30px;
    overflow-x: hidden;
    overflow-y: auto;
    width: 200px;
    max-height: 350px;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    z-index: 5;
    transition: .2s;
}

.mobile-navigation > ul {
    list-style: none;
}
.mobile-navigation > ul > li > a {
    display: block;
    padding: 5px 10px;
    position: relative;
    text-decoration: none;
    cursor: pointer;
}
.mobile-navigation > ul > li > ul > li > a {
    display: block;
    padding: 5px 10px;
    position: relative;
    text-decoration: none;
}

/* menu toggle */
.mobile-nav-toggle {
    font-size: 25px;
    padding: 10px;
    cursor: pointer;
    z-index: 5;
    top: 0; 
    left: 0;
    display: none;
}

/* drop menus */
.mob-nav-drop-backing {
    height: 0;
    overflow: hidden;
    opacity: 0;
    transition: .2s;
}