body {
  background-image: url("sfondo_pagina.jpg);
  background-size: cover;
  background-attachment: fixed;
  background-position: center;
}

h1 {
  background-image: url("hero.png");
  background-repeat: no-repeat;
  font-family: verdana;
  font-size: 40px;
  color: black;
  text-align: center;
}

h2 {
  font-family: verdana;
  font-size: 30px;
  color: black;
  text-align: center;
}
p {
  font-family: verdana;
  font-size: 20px;
} 

tr{
  border: 1px;
  border-color: black;
}
footer {
      background-color: #333;
    
      display: flex;             
      justify-content: space-between; 
      align-items: center;
      padding: 15px 40px;
    }
.footer-left {
      text-align: left;
    }

.footer-center {
      text-align: center;
      flex: 1; 
    }

.footer-right {
      text-align: right;
    }