html, body {
    height: 100%;
}
body {
    display: flex;
    flex-direction: column;
}
.content {
    flex: 1 0 auto;
}
footer {
    flex-shrink: 0;
}
table {
    border-collapse: collapse;
  }

  td,
  th {
    border: 1px solid black;
    padding: 3px;
    text-align: center;
  }

  th {
    font-weight: bold;
    background-color: #E6E6E6;
  }