* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    font-family: "Comic Sans MS";
}
.header {
    padding: 20px;
    text-align: center;
    background-color: black;
    font-size: 27px;
    color: white;
}
.nav {
    border: dotted #39FF14;
    display: flex;
    justify-content: center;
    background-color: blue;
    text-indent: 18px;
    padding: 14px;
    font-size: 26px;
}
.nav a {
    color: #FFFF33;
    text-decoration: none;
}
.main {
    text-align: center;
    background-color: aliceblue;
    font-size: 20px;
    flex: 1;
}
.footer {
    padding: 12px;
    text-align: center;
    background-color: dimgray;
}