html, body, header {
    margin: 0;
    padding: 0;
}

header {
    position: relative;
    min-height: 100vh;
    background-size: cover;
    text-align: center;

    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

header #header-container {
    background-color: red;
}

header .title {
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    font-size: 3em;
    text-transform: uppercase;
}

header .subtitle, header .author {
    font-family: 'Raleway', sans-serif;
    font-weight: bold;
    font-size: 2em;
}

.black {
    color: black;
    text-shadow: 0px 0px 4px white;
}

.white {
    color: white;
    text-shadow: 0px 0px 4px black;
}

section {
    padding: 30px;
    font-family: 'Roboto', sans-serif;
    font-weight: 500;
    width: 800px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.05em;
    line-height: 1.5em;
    text-align: justify;
    text-justify: distribute;
}

@media only screen and (max-width: 860px) {
    section {
        width: calc(100vw - 60px);
    }
}

h1, h2, h3, h4 {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    color: rgb(10, 10, 60);
    text-justify: none;
}

h1, h2 {
    font-size: 2em;
}

h3 {
    font-size: 1.3em;
}

code {
    font-family: 'Roboto Mono';
    font-size: 0.9em;
}

.kw {
    font-weight: bold;
}

th {
    text-align: center;
}

blockquote {
    border-left: 3px solid green;
    padding-left: 20px;
    margin-left: 0;
    color: darkgreen;
}

div#toc ul {
    list-style: none;
}
div#toc>ul {
    padding-left: 0;
}

img {
    max-width: 100%;
}