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HTML

              
                <div class="grid">
  <div class="item test"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    
  <div class="item"></div>    

</div>
              
            
!

CSS

              
                body{
  display:grid;
  place-items:center;
  background: #000;
  min-height:90vh;
}
.grid{
  display:grid;
  grid-template-columns: repeat(5,1fr);
  gap:2px;
  background: #000;
  width:400px;
  height:400px;
}

.grid>*{
  background: #111;
}
.item:hover{
  opacity:0.5
}

.item-custom{
  border-radius:50%;
  background: #fff;
}
              
            
!

JS

              
                // je sauvegarde le 1er .grid
const grid = document.querySelector('.grid');

// j'écoute les click
grid.addEventListener('click', e => {
  // je peaufine en trouvant l'élément cliqué dans grid
  let target = e.target;
  // je vérifie dans la console
  console.log(target);
  // si on a la classe item
  if(target.classList.contains('item')){
    // j'ajoute ou j'enlève la class item-custom
    target.classList.toggle('item-custom');
  }
})
              
            
!
999px

Console