body,html {
  height: 100%;
  width: 100%;
  background-image: url("../img/background.jpg");
  background-position: center;
  background-size: cover;
  }

p {
  font-family: Georgia, serif;
  font-size: 1.2em;
  color: DarkSlateGray;
  }

h1 {
  font-family: Verdana, Geneva, sans-serif;
  font-size: 2.5em;
  color: FireBrick;
  }

#form2 {
  display:none;
  }

input::placeholder {              
  text-align: center;
  color: black; 
  }

.center { 
  justify-content: center;
  align-items: center; /* Optional */
  margin: auto;
  width: 75%;
} 

.flex { 
  display: flex;
  justify-content: center;
  align-items: center; /* Optional */
  margin: auto;
  width: 30%;
}