body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 0 1rem;
  font:
    18px / 1.6 system-ui,
    sans-serif;
  color: #222;
}
.site-header {
  padding: 1rem 0;
  font-weight: 700;
}
.site-header a {
  color: inherit;
  text-decoration: none;
}
.meta {
  color: #666;
  font-size: 0.9rem;
}
.ad {
  margin: 2rem 0;
  min-height: 90px;
  border: 1px dashed #ccc;
  text-align: center;
}
.ad img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
.post-list {
  padding-left: 1.2rem;
}
.site-footer {
  margin: 3rem 0 1rem;
  color: #666;
  font-size: 0.85rem;
}