ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
border: 1px solid #e7e7e7;
background-color: rgba(255,255,255,0.5);
}

li {
float: left;
}

li a {
display: block;
color: rgba(0,0,0,1);
text-align: center;
padding: 14px 16px;
text-decoration: none;
}

li a:hover:not(.active) {
background-color: #ddd;
}

li a.active {
color: white;
background-color: rgba(200,200,200,1);
}