body {
    margin: 0px;
    font-size: 1.0em;
    font-family: Arial, Helvetica, sans-serif;
}

.header {
    background-color: #f1f1f1;
    padding: 10px;
    text-align: center;
}

#navbar {
position: sticky;
top: 0px;
overflow: hidden;
background-color: #010171;
}

#navbar a {
float: left;
display: block;
color: #010171;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
}

#navbar a:hover {
background-color: #010171;
color: yellow;
}

#navbar a.active {
background-color: #55aaff;
color: white;
}