body {
  font-size: 14px;
  line-height: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #443e3e;
  max-width: max-content;
  margin: auto;
  margin-bottom: 80px; }

nav :last-child {
  float: right; }

h1 {
  font-size: 21px; }

h2, h3 {
  font-size: 14px; }

p.math {
  text-align: center; }

img {
  margin: auto;
  display: block; }

a {
  text-decoration: none;
  color: #e21f70; }
  a:hover {
    background: #e21f70;
    color: #fff; }

table {
  margin: 0 auto;
  border-collapse: collapse; }
  table th, table td {
    border: 1px solid #443e3e;
    padding: 4px 8px; }
    table th.nb, table th:empty, table td.nb, table td:empty {
      border: none; }

@media screen and (max-width: 800px) {
  nav, main {
    max-width: 640px;
    margin: 0px 16px; }

  .margin {
    display: block; } }
@media screen and (min-width: 800px) {
  nav, main {
    width: 640px;
    margin: 0px 160px; }

  .margin {
    position: absolute;
    text-align: right;
    margin-left: -160px;
    width: 144px; } }