body {
  background: #f6e6f6;
  font-family: Arial, sans-serif;
}

.container {
  width: 900px;
  margin: 40px auto;
  background: #cfe3f1;
  border: 2px solid #000;
  padding: 20px;
}

.nav {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.nav a {
  text-decoration: none;
  color: black;
}

.active {
  background: yellow;
  padding: 2px 6px;
}

.circle {
  width: 200px;
  height: 200px;
  border: 2px solid #000;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section {
  margin-top: 20px;
}

button {
  padding: 6px 10px;
  border: 1px solid black;
  background: #eaeaea;
  cursor: pointer;
}