style.css

body {
    background-color: #4C4C4C;
    margin-top: 60px;
}

nav {
    left: 0px;
    top: 0px;
    height: 40px;
    width: 100%;
    padding: 5px;
    position: fixed;
    background-color: #383838;
    color: white;
    border-bottom: 2px solid #22EE5B;
    text-align: center;
    font-size: 25px;
}

nav img {
    vertical-align: middle;
}

nav a {
    text-decoration:none;
    color: white;
}

nav a:hover {
    position: relative;
    text-decoration: underline;
    bottom: 1px;
}

nav .first {

    width: 100px;

    left: 0px;
    top: 0px;
    height: 50px;
    position: fixed;
    background-color: #242424;
    color: white;
    text-align: center;
    font-size: 25px;
}

nav .second {

    width: 100px;

    left: 0px;
    top: 50px;
    height: 100%;
    position: fixed;
    background-color: #383838;
    color: white;
    text-align: center;
    font-size: 25px;
    border-right: 2px solid #22EE5B;
}

section {
    left: 102px;
    top: 52px;
    height: 100%;
    width: 100%;
}