<div>
<div style="width:100vw; height:100vh; background-color:red;'">block1</div>
<div style="width:100vw; height:100vh; background-color:blue;">block2</div>
<div style="width:100vw; height:100vh; background-color:rgreen;">block3</div>
<div style="width:100vw; height:100vh; background-color:yellow;">block4</div>
</div>