body {
  padding: 2em;
  color: #202122;
  background: #FFF;
}
header {
  border-bottom: 1px solid #333;
}
header h1 a {
  text-decoration: none;
  color: inherit;
}
figure {
  display: grid;
  place-items: center;
  margin: 0;
}
figure img {
  padding: 1em;
}
figure figcaption {
  text-align: center;
}
#one-big-union img {
  width: 400px;
  max-width: 90%;
  height: auto;
  aspect-ratio: 400/345;
}
.text-center {
  text-align: center;
}
.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  border: 1px solid #36c;
  background-color: #36c;
  padding: 0.5rem 1rem;
  font-size: 1.25rem;
  line-height: 1.5;
  border-radius: 0.3rem;
  color: #FFF;
}
.btn:hover {
  background-color: #3056a9;
}
.warning {
  background-color: #fed07d;
  margin: 0.5rem auto;
  padding: 1rem;
  max-width: 90%;
  border-radius: 0.5rem;
}
.warning h3 {
  margin-top: 0;
  text-align: center;
}
.warning ul {
  padding: 0 2rem;
}
.warning ul li {
  margin-bottom: 0.5em;
}