table {
  width: 100%;
  border-collapse: collapse;
  font-family: Arial, sans-serif;
}

th, td {
  border: 1px solid #000;
  padding: 10px;
  text-align: left;
}

thead th {
  border-bottom: 3px solid #000;
  font-weight: bold;
  background-color: #f2f2f2;
}