html, body {
  height: 100%;
  margin: 0;
}


body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    margin-top: 64px;

    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    justify-content: space-between;
    background-color: #464646;
    align-items: center;
    position: fixed;
    display: flex;
    padding: 10px;
    right: 0;
    color: #fff;
    z-index: 7;
    left: 0;
    top: 0;
}
header > nav {
    justify-content: right;
    display: flex;
    gap: 10px;
}
header > nav > a {
    color: #fff;
}

main {
    background-color: #2b2b2b;
    min-height: 400px;
    color: #fff;
    flex: 1;
}

footer {
    background-color: #202020;
    display: flex;
    align-items: center;
    flex-direction: column;
    color: #fff;
}

a {
    text-decoration: none;
    color: #bcd7ff;
} a:hover {
    text-decoration: underline;
}

.tux-army {
  width: 100%;
  height: 200px;
  background-image: url("https://kryspak.com/static/mono_tux.webp");
  background-repeat: repeat-x;
  opacity: 0.1;
}