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<!DOCTYPE html> 
<html>
 <head>
  <title>Title of the document</title>
  <style>
     body{
        margin: 0;
        font-size: 15px;
    }

    [class*="col-"] {
        width: 100%;
        float: left;
        padding: 15px;
    }

    * {
      box-sizing: border-box;
    }

    img{
        max-width: 100%;
    }

    .row {
      float: left;
      width: 100%;
    }

    .container{
        margin: 0 auto;
        width: 100%;
        max-width: 1120px;
    }

    .container img:first-child{
        padding-bottom: 30px;
    }

    @media only screen and (min-width: 992px) {
        .col-1 {width: 8.33%;}
        .col-2 {width: 16.66%;}
        .col-3 {width: 25%;}
        .col-4 {width: 33.33%;}
        .col-5 {width: 41.66%;}
        .col-6 {width: 50%;}
        .col-7 {width: 58.33%;}
        .col-8 {width: 66.66%;}
        .col-9 {width: 75%;}
        .col-10 {width: 83.33%;}
        .col-11 {width: 91.66%;}
        .col-12 {width: 100%;}

    }

    @media only screen and (min-width: 768px) and (max-width: 991px) {
        .col-s-1 {width: 8.33%;}
        .col-s-2 {width: 16.66%;}
        .col-s-3 {width: 25%;}
        .col-s-4 {width: 33.33%;}
        .col-s-5 {width: 41.66%;}
        .col-s-6 {width: 50%;}
        .col-s-7 {width: 58.33%;}
        .col-s-8 {width: 66.66%;}
        .col-s-9 {width: 75%;}
        .col-s-10 {width: 83.33%;}
        .col-s-11 {width: 91.66%;}
        .col-s-12 {width: 100%;}

    }

    @media only screen and (max-width: 767px){ 
        .col-m-1 {width: 8.33%;}
        .col-m-2 {width: 16.66%;}
        .col-m-3 {width: 25%;}
        .col-m-4 {width: 33.33%;}
        .col-m-5 {width: 41.66%;}
        .col-m-6 {width: 50%;}
        .col-m-7 {width: 58.33%;}
        .col-m-8 {width: 66.66%;}
        .col-m-9 {width: 75%;}
        .col-m-10 {width: 83.33%;}
        .col-m-11 {width: 91.66%;}
        .col-m-12 {width: 100%;}
    }
  </style>
 </head>
 <body>
    <!DOCTYPE html> 
<html>
 <head>
  <title>Title of the document</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link href="style.css" rel="stylesheet"></link>
 </head>
 <body>
   <div class="container">
	   <div class="row">
		  <div class="col-4 col-s-6 col-m-12">
			 <img src="https://s3.amazonaws.com/codecademy-content/courses/ltp/img/mexico-city.png" />
			 <img src="https://s3.amazonaws.com/codecademy-content/courses/ltp/img/ny.png" />
		  </div>
		  <div class="col-4 col-s-6 col-m-12">
			 <img src="https://s3.amazonaws.com/codecademy-content/courses/ltp/img/tokyo.png" />
			 <img src="https://s3.amazonaws.com/codecademy-content/courses/ltp/img/paris.png" />
		  </div>
		  <div class="col-4 col-s-6 col-m-12">
			 <img src="https://s3.amazonaws.com/codecademy-content/courses/ltp/img/invite.png" />
		  </div>
	   </div>
   </div>
 </body>
</html>
 </body>
</html>