/* variables */

:root {
  --background: #c0c0c0;
  --text: #1c1c1c;
}

* {
  margin: 0;
  padding: 0;
}

/* main styles */

html,
body {
  width: 100%;
  height: 100%;
}

body {
  background: var(--background);
  color: var(--text);
  font-family: "courier new", monospace;
  display: flex;
  flex-direction: row;
  overflow: hidden;
}

a {
  color: var(--text);
}

a:hover {
  color: var(--background);
  background: var(--text);
}

img {
  max-width: 100%;
  height: auto;
  width: auto\9; /* ie8 */
}

/* navigation */

nav {
  padding: 20px;
}

nav ul {
  list-style-type: none;
}

nav a {
  display: block;
  border: 1px solid var(--text);
  margin-bottom: 3px;
  padding: 3px;
  text-decoration: none;
}

/* header */

header {
  margin: 16px 0;
}

/* main content */

.wrapper {
  overflow-y: auto;
  padding: 0 20px;
}

main h2,
main h3,
main p {
  margin: 16px 0;
}

main hr {
  border: 0;
  border-top: 1px solid var(--text);
}

main ul,
main ol {
  padding-left: 30px;
}

main ul {
  list-style-type: square;
}

/* smaller screens */

@media screen and (max-width: 650px) {
  body {
    flex-direction: column;
    overflow-y: visible;
  }

  nav {
    padding: 10px 10px 0;
  }

  nav a {
    padding: 5px;
  }

  .wrapper {
    overflow: visible;
  }
}