#crypto-return-container {
  max-width: 600px;
  background: #fff;
  padding: 25px;
  margin: 30px auto;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  font-family: 'Segoe UI', sans-serif;
}
#crypto-return-container h2 {
  text-align: center;
  margin-bottom: 20px;
}
#crypto-return-form label {
  font-weight: bold;
  margin-top: 15px;
  display: block;
}
#crypto-return-form select,
#crypto-return-form input {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 6px;
  border: 1px solid #ccc;
}
#crypto-return-form button {
  width: 100%;
  padding: 12px;
  margin-top: 20px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
}
.result-box {
  background: #f1f1f1;
  padding: 15px;
  border-radius: 6px;
  margin-top: 20px;
}
canvas#crypto-return-chart {
  margin-top: 20px;
}