Indonesia Flag tutorial

This is what goes on HTML:

    
     <div class="flag">
      <div class="half" style="background-color: #ef3340"></div>
      <div class="half" style="background-color: white"></div>
    </div>
    

This is what goes on CSS:

      .flag {
        display: flex;
        flex-direction: column;
      }

      .half {
         height: 75px;
         width: 250px;
      }