body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.main {
    padding: 20px;
}

.nav-bar {
    position: fixed;
    bottom: 0;
    background-color: #333;
    width: 100%;
    height: 36px;
}

.nav-bar a {
    text-decoration: none;
    color: #fff;
    padding: 12px 16px;
    font-size: 18px;
    display: inline-block;
    line-height: 12px;
    margin-left: -5px;
}

.active {
    background-color: #0081cb;
}

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