/* Applies to the entire body of the HTML document (except where overridden by more specific selectors). */
body {
    margin: 25px;
    background-color: rgb(240,240,240);
    font-family: arial, sans-serif;
    font-size: 14px;
  }
  
  /* Applies to all <h1>...</h1> elements. */
  h1 {
    font-size: 35px;
    font-weight: normal;
    margin-top: 5px;
    color: red;
  }
  
  /* Applies to all elements with <... class="someclass"> specified. */
  .someclass { color: red; }
  
  /* Applies to the element with <... id="someid"> specified. */
  #someid { color: green; }