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

.main {
    padding: 20px;
}

.nav-bar {
    position: fixed;
    bottom: 5px;
    background-color: #333;
    width: 100%;
    text-align: right;
}

.nav-bar a {
    text-decoration: none;
    color: #fff;
    padding: 10px;
    display: inline-block;
    border-bottom: 4px solid transparent;
}

.nav-bar a:hover {
    border-bottom: 4px solid #0081cb;
}