html {
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    background-color: rgb(209, 142, 104);
    height: 100%;
}

body {
    flex: 1;
    margin: auto 2em;
    display: flex;
    flex-direction: column;

    background-color: white;
    text-align: center;
    border-left: 3px solid black;
    border-right: 3px solid black;
}

.logo {
    background-color: rgb(162, 194, 151);
    margin: 1em 2em;
    padding: .8em;
    border: 3px outset darkgreen;;
}

header {
    margin: 1em;
    flex: 0;
}
header h1 {
    margin: 0;
}
header ul {
    margin: 0;
    padding: 0;
}
header li {
    display: inline;
    list-style-type: none;
}
header li + li::before {
    content: "| ";
}


main {
    flex: 1;
}

article {
    margin: 2em 3em;
    text-align: justify;
    font-family: sans-serif;
}
article h1 {
    text-align: left;
}
article p.signature {
    font-family: monospace;
    font-size: 1.3em;
    text-align: right;
}

div.error {
    background-color: #f44545;
    margin: 0em 2em;
    padding: 0.7em;
    border: 2px outset darkgrey;
}

footer {
    flex: 0;
}

.center {
    text-align: center;
}