h1{color:pink;
text-align:center;
font-sizes:24 px}
p
{text-indent: 70px;
text-align:center;
font-sizes:24 px}
  <style>
    a:link {
      color: blue;
      text-decoration: none;
      font-weight: bold;
    }

    a:visited {
      color: purple;
    }
  </style>
  img{max-width:200px}
  .formula{color:red;font-size:25px}
body{
margin: 0;
}
nav{
	background-color: red;
	padding: 15px;
}
nav a{
	 color: white;
	 padding: 15px;
	 margin: 20px 10px;
	 background-color: black;
	 tex-decoration: none;
    }
section{
	margin-left: 20px;
}
}