body {
  background-color: #0a0a0a;
  color: #f1f1f1;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background: #111;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header h1 {
  color: #0ff;
}
nav a {
  margin-left: 20px;
  color: #eee;
  text-decoration: none;
}
main {
  padding: 20px;
}
h2 {
  color: #0ff;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}
th, td {
  border: 1px solid #444;
  padding: 8px;
  text-align: center;
}
input, select, button {
  padding: 8px;
  margin: 5px 0;
}
footer {
  background: #111;
  color: #999;
  text-align: center;
  padding: 10px;
}