header{
height: 68px;
width: 100%;
background-color: black;
}

.logo{
    text-align: center;   
}
.logo img{
    margin-top: 5px;
}

.nav ul {
    margin-top: 0px;  
    margin-bottom: 0px;
    text-align: center;
}
.nav ul li {
    display: inline-block;
    margin: 0 15px 0 15px;
}
.nav li a{
    color: white;    
    font-weight: 700;
    text-decoration: none;
}
.nav li a:hover{
    color: white;
    border-bottom:solid;
    border-color:#FFFFFF;
    border-width:3px;
}