* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    box-sizing: border-box;
}

.nav-bar {
    width: 100%;
    position: fixed;
    z-index: 1;
    background-color: #333;
    top: 0;
    left: 0;
}

.nav-bar a {
    text-decoration: none;
    color: #fff;
    float: left;
    padding: 12px;
}

.nav-bar a:hover {
    background-color: #0081cb;
}

.main {
    margin-top: 12px;
    position: absolute;
    height: 2000px;
}