<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<body style="background-color:rgb(60,90,149);height:1200px;">
<div class="container">
<h1>family picture</h1>
<div class="row">
<div class ="col-md-6">
<div class="rope"><div class="nail"></div></div>
<div class="canvas">
<img src="https://image.freepik.com/vecteurs-libre/dessin-de-bande-dessinee-de-famille_23-2147495912.jpg">
</div>
</div>
<div class ="col-md-6">
<div class="rope"><div class="nail"></div></div>
<div class="canvas">
<img src="https://png.pngtree.com/element_origin_min_pic/17/03/23/0c4c97ea35eaf44cee6bbf56a3847c6d.jpg">
</div>
</div>
<div class ="col-md-6">
<div class="rope"><div class="nail"></div></div>
<div class="canvas">
<img src="https://media.istockphoto.com/vectors/happy-family-having-fun-summer-landscape-background-vector-id812064710?k=6&m=812064710&s=612x612&w=0&h=0kUGW8JyJAQdVnsaP-9BtnlawI_nONZlzTEoFFDXK14=">
</div>
</div>
<div class ="col-md-6">
<div class="rope"><div class="nail"></div></div>
<div class="canvas">
<img src="https://media.istockphoto.com/vectors/family-posing-for-a-picture-cartoon-vector-id865006230?k=6&m=865006230&s=612x612&w=0&h=c3hnKRHTekV-X0L2JfdTvJRGa0JMYiEXQ1YY1KW9Q64=">
</div>
</div>
</div>
</div>
</body>