JSFiddle - React, Tailwind, and code Playground

HTML

<body class="menu">
<header>
	<nav class="menu-side">
	<ul>
			  <li class="icon-home"><a href="Premiership.html"><span>Home</span></a></li>
			
            <li class="arrow"> <a  class="star" href="#">England</a>
                <ul>
                    <li><a class="ee" href="Premiership.html">Premiership</a>
                    </li>
                    <li><a href= "Unavailble.html">Championship</a>
                    </li>
                    <li><a href="Unavailble.html">League 1</a>
                    </li>
                    <li><a href="Unavailble.html">League 2</a>
                    </li>
                </ul>
            </li>
            <li class="arrow"> <a  href="#">France</a>
                <ul >
                    <li id="r"><a class="ee" href="Unavailble.html">Ligue 1</a> 
                    </li>
                </ul>
            </li>
            <li class="arrow"> <a href="#">Germany </a>

                <ul>
                    <li><a class="ee" href="Unavailble.html">Bundesliga</a>
                    </li>
                </ul>
            </li>
            <li class="arrow"> <a href="#">Italy</a>

                <ul>
                    <li><a class="ee" href="Unavailble.html">Serie A</a>
                    </li>
                </ul>
            </li>
            <li class="arrow"> <a href="#">Spain</a>
                <ul>
                    <li><a  class="ee" href="Unavailble.html">La Liga</a>
                    </li>
                </ul>
            </li>
        </ul>    
	</nav>
	
	</header>
	
	
</body>

CSS

.menu{
	position: relative;
	left: 0;
	
}

.menu-open{
left: 0;


}

.menu-open .menu-side{
left: 0;

}

.menu-side, menu {
-webkit-transition: left 0.2s ease;
-moz-transition: left 0.2s ease;
transition: left 0.2s ease;

}

.menu-side{
	background-color: #333;
	color: #fff;
	position: fixed;
	top: 0;
	left: 0;
	width: 210px;
	height: 100%;
	padding: 2px;
}

body{
display: block;
	margin: 8px;
background: #f0f0f0;
}


nav ul{
background-color: #43a286;
overflow: hidden;
	color:white;
padding: 0;
	text-align: center;
	margin: 0;
	width: 100%;
	height: 100%;
	-webkit-transition: max-height 0.4s;
	-ms-transition: max-height 0.4s;
	-moz-transition: max-height 0.4s;
	-o-transition: max-height 0.4s;
	transition: max-height 0.4s;
}

nav ul li{
display: block;
padding: 20px;
width: 80%;
text-align: center;
}

nav ul li:hover {
background-color: #399077;
	
}

nav ul .arrow:hover{
border-right: 10px solid white;
border-right-width: thick;
width: 79%;
}

nav ul ul {
	height: auto;
	display: none;
	position:absolute;
	background-color: #399077;
	margin-left: 89.5%;
	top: 9%;
	z-index:150;
}

nav ul ul li{
  display: block;
    width:75%;
	text-align: center;
}


nav ul li:hover ul{

	  display: block;
      width: 165px;
}

/*nav .ee:after {
  content: '';
  width: 0;
  height: 0;
  border-top: 8px solid black;
  border-right: 8px solid transparent;
  border-left: 8px solid transparent;
  position: absolute;
  z-index: 1;
  top: 0%;
  left: 50%;
  margin-left: -6px
} */

nav ul li a, visited{
color:white;
font-family: 'CFJackStory-Regular', Helvetica, Arial, sans-serif;
display: block;
text-decoration: none;
}

nav ul ul li a:hover{
color:white;
font-size: 20px;
}