body {
  background-color: #121212;
  color: #f5f5f5;
  font-family: Arial, sans-serif;
}

header, footer {
  background-color: #1e1e1e;
  padding: 15px;
  text-align: center;
  font-size: 1.2em;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 15px;
}

select, input {
  background-color: #222;
  color: #f5f5f5;
  border: 1px solid #444;
  padding: 5px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

th, td {
  border: 1px solid #444;
  padding: 8px;
  text-align: center;
}

th {
  background-color: #222;
}

canvas {
  background-color: #1a1a1a;
  padding: 10px;
  margin-top: 20px;
}