* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 20px;
  font-family: Arial, sans-serif;
  background-color: #121212;
  color: #e0e0e0;
}
h2, h3 {
  margin-top: 1em;
  color: #ffffff;
}
section {
  margin-top: 30px;
}
label, select, input, button {
  font-size: 1em;
}
select, input {
  padding: 6px;
  margin-top: 10px;
  background-color: #1e1e1e;
  color: #ffffff;
  border: 1px solid #444;
  border-radius: 5px;
}
button {
  background-color: #2e7d32;
  color: white;
  padding: 6px 12px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
button:hover {
  background-color: #388e3c;
}
canvas {
  background-color: #1a1a1a;
  border-radius: 10px;
  padding: 10px;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}
table, th, td {
  border: 1px solid #333;
}
th, td {
  padding: 10px;
  text-align: left;
}
th {
  background-color: #1f1f1f;
}
tr:nth-child(even) {
  background-color: #1a1a1a;
}