* {
    box-sizing: border-box;
}

body {
    font-family: Verdana, Arial;
    background-color: #212121;
    color: whitesmoke;
}

header {
    overflow: hidden;
    width: 100%;
    height: 50px;
    font-size: 1.5em;
    text-align: center;
}

.title {
    margin: auto;
}

nav.topnav {
    overflow: hidden;
    background-color: #333;
    display: flex;
    justify-content:center;
}

nav.topnav a {
    color: #f2f2f2;
    float: left;
    display: block;
    padding: 14px 16px;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.5s, color 0.5s;
}

nav.topnav a:hover {
    background-color: #ddd;
    color: black;
    transition: all 0.5s;
}

footer {
    width: 100%;
    background-color: #333;
    position: fixed;
    bottom: 0px;
    left: 0px;
}

.content::after {
    content: "";
    clear: both;
}

.column {
    margin-top: 20px;
    background-color: #323232;
}