body {
  font-family: Arial, Helvetika, sans-serif;
  font-size: 100%;
  margin: 50px;

}
h1 {
  color: #000;
  padding: 5px;
}
a:link, a:visited {
  color: #000;
  text-decoration: none;
  margin: 15px;
}
.cella1 {
  width: 200px;
  height: 40px;
  vertical-align: center;

}
.cella2 {
  width: 80px;
  height: 40px;
  vertical-align: center;