body {
  background-color: #101010;
  color: #ffffff;
}
h1 {
  color: #ffffff;
}
nav a {
  color: #ffffff;
}
footer {
  color: #ffffff;
}

table {
  /* Not required only for visualizing */
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

table thead tr th {
  /* you could also change td instead th depending your html code */
/*   background-color: green; */
  position: sticky;
  z-index: 100;
  top: 0;
}

td {
  /* Not required only for visualizing */
  padding: 1em;
}