body {
  background-color: black;
  transition: background-color 7s;
}

h1 {
  background-color: #00ff00;
}

p {
  color: rgb(255,0,255);
}

img {
  position: absolute;
  width: 75%;
  height: auto;
  margin: auto;
  left: 0; 
  right: 0;
  top: 0;
  bottom: 0;  
  border: 1px solid rgb(255,0,255);
}

#footer{ 
  position: fixed;     
  text-align: center;    
  bottom: 0px; 
  width: 100%;
}