About the file structure

A HTML consists of two main parts:



The code in the CSS file describes how the body and form part look like.

html {
    background: #eee;
     }
body {
    background: #eee;
    color: #333;
    font: 75%/1.3 "Helvetica Neue", Helvetica, Arial, sans-serif;
    padding: 20px; 
      }
form {
    padding: 20px;
    box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.16), 0px 2px 10px 0px rgba(0, 0, 0, 0.12) !important;
     }