nav{
    width: 100%;
    border-top: 1px solid orange;
    border-bottom: 1px solid orange;
    overflow: hidden;
    margin-bottom: 1em;
}
nav ul{
    width: 80%;
    margin: 0 auto;
    list-style: none;
}
nav li{
    width: calc(20% - 2px);
    border-left: 1px solid orange;
    text-align: center;
    float: left;
}
nav li:last-child{
    border-right: 1px solid orange;
}
nav a{
    display: block;
    text-decoration: none;
    color:#FFFFFF;
    font-size: 110%;
    letter-spacing: 5px;
    font-weight: 400;
    line-height: 45px;
}
nav a:hover{
    background-color: orange;
    color: #ffffff;
    transition: 0.5s;
}