html {
    background-color: #191919;
    font-family: Arial, sans-serif;
}

header {
    text-align: right;
}

body {
    margin: 0 75px 20px 75px;
    padding: 0;
    box-sizing: border-box;
}

h1, h2, h3, h4, p, li, code, footer {
    color: whitesmoke;
    margin: 20px 0px;
}

hr {
    margin: 10px -75px;
    border-top: 1px solid whitesmoke;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
}

.high-quality-img {
  width: 400px;
  height: auto;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

code {
  background-color: #393939;
  font-family: "Courier New", monospace;
  white-space: pre-wrap;
  word-break: break-word;
  padding-left: 3px;
  padding-right: 3px;
  border-radius: 3px;
}

pre {
  display: inline-block;
  max-width: 100%;
}

pre code {
  display: block;
  overflow-x: auto;
  white-space: pre;
  word-break: normal;
  padding: 5px 10px;
  margin: 0px;
}

h1 {
    font-size: 40px;
}

h2 {
    font-size: 36px;
}

h3 {
    font-size: 32px;
}

h4 {
    font-size: 28px;
}

a, p, li, code, footer {
    font-size: 20px;
}

p {
    text-align: justify;
    line-height: 1.4;
}

ul, li {
    margin: 5px;
}

a {
    color: #ff00ff;
    margin: 50px 0px;
    text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container a {
    line-height: 1.4;
    font-size: 28px;
}

footer {
    text-align: center;
}

.container {
    display: flex;
    justify-content: space-between;
}

.right-column {
    text-align: right;
}

.left-column {
    text-align: left;
}

.invisible h3,
.invisible a {
    color: #191919;
}

.centered {
    text-align: center;
}