@media screen and (max-width: 679px) {
a:hover   {background-color: #C0C0C0; }
a:active  {background-color: #808080; }

nav {
   clear: left;	
	position: relative;
   display: block;
margin-top: 6em;
margin-bottom: 8em;
   padding: 0;
	width: 100%;
	color: white;
    }

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li {
	font-size: 1em;
   list-style-type: none;
	width: 25%;
	float: left;
    }
    
nav a {
	display: flex;
   align-items: center;
   justify-content: center;
	white-space: nowrap;
	text-decoration: none;
	font-weight: normal;
	
}
}

@media screen and (min-width: 680px) {
	a:hover   {background-color: #C0C0C0; }
	a:active  {background-color: #808080; }	
	
	nav {
		float: right;
		margin-top: 1em; 
		margin-right: 3em;
		margin-bottom: 1em; 
	}
	
	nav ul {
 		list-style: none;
  	margin: 0;
  padding: 0;
}

nav li {
	font-size: 1em;
   list-style-type: none;
    }
    
nav a {
	font-style: normal;
	text-decoration: none;
	
}
}

@media screen and (min-width: 1280px){

a:hover   {background-color: #C0C0C0; }
a:active  {background-color: #808080; }

nav {
	height: 100%;
   color: white;
   position: absolute;
   right: 2em;
   bottom: -4.5em;
   float: right;
    }

nav ul {
  list-style: none;
  margin-bottom: 1em;
  margin: 0;
  padding: 0;
}

nav li {
	font-size: 1em;
   list-style-type: none;
   padding: 0.5em;
   border-width: 1px;
   border-left: solid;
   border-color: white;
   float:left;
    }
    
nav a {
	display: block;
	margin: auto;
	white-space: nowrap;
	text-decoration: none;
	font-weight: normal;
	
}
}