style.css

html {
    font-family: Open Sans,Arial;
}

body {
    color: #454545;
    font-size: 16px;
    margin: 1em auto;
    max-width: 800px;
    padding: 1em;
    line-height: 1.4;
    text-align: justify;
}

pre {
    font-size:13px;
    font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

a {
    color: #07a;
}

a:visited {
  color: #941352;
}

.centered {
    text-align: center;
}

.justify-right {
    display: flex;
    justify-content: flex-end;
}

.justify-right > p {
    margin: 0;
}

.header-container {
    display: flex;
}
.header-date {
    white-space: nowrap;
    margin: 1em 1em 1em auto;
}