body {
  margin: 0;
  font-family: sans-serif;
  background-color: #0e1a2b;
  color: #ffffff;
}
header {
  text-align: center;
  padding: 1rem;
}
.main-logo {
  width: 220px;
  margin: 1rem auto;
}
nav {
  margin: 1rem 0;
}
nav a {
  color: #ffffff;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 2rem;
  max-width: 1000px;
  margin: auto;
}
section {
  margin-bottom: 3rem;
}
.centered {
  text-align: center;
}
img.dna-gif, img.drop-gif {
  width: 160px;
  display: block;
  margin: 1rem auto;
}
footer {
  text-align: center;
  padding: 1rem;
  border-top: 1px solid #ffffff33;
}
label {
  font-weight: bold;
}