header {
  text-align: center;
  background-size: cover;
  color: white;
  background: url("https://www.gettingsmart.com/wp-content/uploads/2015/09/school-art-seamless-964x670.jpg");
}
body {
  Font: Georgia;
  color: white;
  background: url("https://www.fredrogerscenter.org/wp-content/uploads/2015/11/dark-grey-background-FRC-Grey.png");
  background-size: cover;
  background-repeat: no-repeat;
}
table, th, td {
  margin: 15px auto;
  border: 5px solid rgb(255, 255, 255);
  border-collapse: collapse;
  padding: 15px;
}
.thumbnail  {
  margin: 0 auto;
  border-radius: 12;
}