JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="layer1">
         <div class="col"></div>
         <div class="col"></div>
         <div class="col"></div>
         <div class="col"></div>
         <div class="col"></div>
         <div class="col"></div>
     </div>
     <div class="layer2">
         <div class="example">фото</div>
         <div>вся структура страницы</div>
     </div>
</div>

CSS

.layer1{height:200px;
       background-color: black;
        position: relative;
        z-index: 0;}
    
.col{width: 30px;
	   border-right: 1px solid white;
     float:left;}

.layer2{position: absolute;
        top: 0;
        z-index: 1;
        color: red;
        text-transform: uppercase;}
        
.example{margin-top: 10px;
        height: 80px;
        width: 80px;
        background-color: grey;
        position relative;
        z-index: 10;
        color: black;}

JavaScript

$(document).load(function() {

    $('.col').height( $('.layer2').height() + 20 );

});