nav div {padding: 12px; display: none; cursor: pointer; color: #292929; font-size: 24px; position: absolute; right: 0; top: 0; width: auto;}
nav ul {margin: 0px; padding: 0px; background: #e3e3e3; list-style-type: none; position: relative; text-align: left;}
nav ul li {display: inline-block;}
nav ul li span {position: relative; top: 2px; left: 4px;}
nav ul li a {padding: 10px 15px; color: #292929; text-decoration: none; display: block; font-size: 18px;}
nav ul li:hover {background: lightgrey;}
nav ul ul {position: absolute; min-width: 250px; background: lightgrey; display: none;}
nav ul ul li {display: block; background: #e3e3e3; position: relative;}
nav ul li:hover ul {display: block;}
nav ul ul ul {position: absolute; left: 100%; top: 0; display: none; background: lightgrey;}
nav ul li:hover ul ul {display: none;}
nav ul ul li:hover ul {display: block;}

nav .material-menu {font-size: 40px;}
nav .arrow {display: inline-block; font-size: 14px;}



@media only screen and (max-width: 768px) {

#menu {position: absolute; top: 0; right: 0; z-index: 50;}
#menu nav ul, #menu nav ul ul, #menu nav ul ul ul {width: 100%;}

nav div {display: block; transition: 0.3s;}
nav div.open-menu {/*top: 30px; right: 30px;*/}
nav ul {display: none; position: static; background: #e3e3e3;}
nav ul li {display: block;}
nav ul ul li {background: #f1f1f1;}
nav ul ul li a {padding-left: 2em;}
nav ul ul ul li {background: #f8f8f8;}
nav ul ul ul li a {padding-left: 4em;}
nav ul ul, nav ul ul ul {position: static; display: none;}

}



@media only screen and (min-width: 769px) {

nav ul ul, nav ul ul ul {display: block; visibility: hidden; transition: 0.5s; opacity: 0;}
nav ul li:hover > ul, nav ul ul li:hover > ul {visibility: visible; opacity: 1;}
nav ul ul ul {top: auto; left: 100%; margin-top: -36px;}

}