body {
  font-family: sans-serif;
  background-color: #fefefe;
  color: #333;
  margin: 0;
  line-height: 1.6;
}
header, section {
  padding: 2em;
  max-width: 800px;
  margin: auto;
}
header {
  background-color: #e0f7f1;
  text-align: center;
}
header h1 {
  font-size: 2em;
  margin-bottom: 0.5em;
}
header button {
  margin: 0.5em;
  padding: 0.8em 1.5em;
  font-size: 1em;
  border: none;
  border-radius: 8px;
  background-color: #00897b;
  color: white;
  cursor: pointer;
}
section h2 {
  font-size: 1.5em;
  color: #00796b;
}
.two-column {
  display: flex;
  flex-wrap: wrap;
  gap: 1em;
}
.column {
  flex: 1;
  min-width: 280px;
}
.qa, .participation {
  background-color: #f0f0f0;
  border-radius: 8px;
  padding: 1em;
}
footer {
  background-color: #eee;
  text-align: center;
  padding: 1em;
  margin-top: 2em;
  font-size: 0.9em;
}