:root {
  --max-width: 800px;
  --color-link: #000000;
}

html {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  margin: 0;
  padding: 0;
  height: 100%;
  color: #000;
  font-family: serif;
  font-size: 20px;
  line-height: 1.8;
}

@media (max-width: 768px) {
  body {
    font-size: 16px;
  }
}

.container {
  margin: 0;
  padding: 1rem;
}

.site_title {
  font-size: 2.2rem;
  font-weight: bold;
  margin: 0;
  padding: 0;
}

.sub_title {
  font-size: 1.2rem;
  margin: 0;
  padding: 0;
}

header {
  max-width: var(--max-width);
  margin-bottom: 3rem;
}

main {
  max-width: var(--max-width);
}

article {
  margin-bottom: 4rem;
  padding: 0;
}

article .title {
  font-size: 2rem;
}

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

footer {
  padding: 1rem 0;
  max-width: var(--max-width);
  text-align: center;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link);
  text-decoration: none;
}

a:visited {
  color: var(--color-link);
  text-decoration: none;
}