body {
  background-color: #000000;
  color: #ffffff;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #1a1a1a;
  padding: 20px;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
nav ul li {
  display: inline;
  margin-right: 20px;
}
nav ul li a {
  text-decoration: none;
  color: #ffffff;
}
.main-content {
  padding: 50px;
}
.yellow-section {
  background-color: #ffd700;
  padding: 30px;
  margin-bottom: 20px;
}
footer {
  background-color: #1a1a1a;
  text-align: center;
  padding: 20px;
  position: absolute;
  bottom: 0;
  width: 100%;
}
table {
  border-collapse: collapse;
  width: 100%;
}

table, th, td {
  border: 1px solid black;
}

th, td {
  padding: 8px;
  text-align: center;
}

th {
  background-color: #f2f2f2;
}