html{
	background: url(foto-poverhnost-mars-planeta.jpg) fixed;
	background-size: cover;
	}
body {
  width: 800px;
  margin: 30px auto; 
  background-color: white;
  color: black;
  font-family: Verdana;
}
h1
   {margin: 0;
   font: bold 50px Verdana;
   text-align: center;
   background:#8B3F3F ;
   color: rad;
   }
nav
   {margin: 0;
   font: bold 2S0px Verdana;
   text-align: center;
   background:#53FF23 ;
   color: rad;;
   }

nav a {
text-decoration: none;
color: #FF2341S;
}
nav a:hover{color: #2334FF;}
.zachet {
margin: 30px;
}