body {
  background: #0f172a;
  margin: 0;
  color: white;
  font-family: sans-serif;
  text-align: center;
}

h1 {
  margin-top: 30px;
  font-size: 40px;
}

.box {
  margin: 20px;
}

input {
  width: 250px;
  padding: 8px;
  border-radius: 8px;
  border: none;
}

#result {
  margin: 20px;
  font-size: 20px;
}

canvas {
  margin: 20px;
  background: #1e293b;
  border-radius: 15px;
}
.back-btn {
  margin: 20px;
  padding: 10px 15px;
  border-radius: 10px;
  border: none;
  background: #1e293b;
  color: white;
  cursor: pointer;
}

.back-btn:hover {
  background: #38bdf8;
  color: black;
}