body {
    margin: 0;
    background-color: #f0f0f5;
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

header {
    position: sticky;
    top: 0;
    z-index: 999;
    background-color: #003153;
    color: white;
}