body {
  font-family: sans-serif;
  background: #1e1e1e;
  color: #eee;
  margin: 0;
  padding: 0;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: #222;
}
main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 1rem;
  padding: 1rem;
}
.block {
  background: #2c2c2c;
  padding: 1rem;
  border-radius: 8px;
}
h1, h2 {
  margin: 0 0 1rem 0;
}
.clock {
  font-size: 1.5rem;
}