body {
  font-family: Arial, sans-serif;
  background-color: #f0f7f4;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 30px;
}

.container {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 320px;
  text-align: center;
}

h1 {
  color: #2e7d32;
  margin-bottom: 0.5em;
}

form {
  margin: 20px 0;
}

select, button {
  padding: 10px;
  margin-top: 10px;
  width: 100%;
  font-size: 1em;
  border-radius: 6px;
  border: 1px solid #ccc;
}

button {
  background-color: #4caf50;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #388e3c;
}

#tip {
  margin: 20px 0;
  font-style: italic;
  color: #555;
}

canvas {
  margin-top: 20px;
  max-width: 100%;
}