body {
  background-image : url("rayas.jpg");
  text-align: center;
  font-family: "Times New Roman"
}

#tabla {
  margin: auto;
	width: auto;
	height: auto;
  border-collapse: collapse;
  border: 1px solid black;
}

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

header{
  font-size: 30px;
}