<div class="container">
     <div class="item item1">1</div>
     <div class="item item2">2</div>
     <div class="item item3">3</div>
     <div class="item item4">4</div>
     <div class="item item5">5</div>
     <div class="item item6">6</div>
     <div class="item item7">7</div>
     <div class="item item8">8</div>
     <div class="item item9">9</div>
     <div class="item item10">10</div>
     <div class="item item11">11</div>
     <div class="item item12">12</div>
     <div class="item item13">13</div>
     <div class="item item14">14</div>
     <div class="item item15">15</div>
     <div class="item item16">16</div>
     <div class="item item17">17</div>
     <div class="item item18">18</div>
     <div class="item item19">19</div>
     <div class="item item20">20</div>
   </div>
   <style>
     .container {
       display: grid;

       grid-template-columns: repeat(5, 1fr);
     }
   </style>