body {
  background-color: #121212;
  color: #f1f1f1;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
}
input, button {
  margin-top: 10px;
  padding: 8px;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}
table, th, td {
  border: 1px solid #333;
}
th, td {
  padding: 10px;
}
canvas {
  margin-top: 30px;
}