Estonia flag tutorial

This is what goes on HTML:

    <div class="horizontalStyle"> 
        <div class="blue horizontal"></div>
        <div class="black horizontal"></div>
        <div class="white horizontal"></div>
    </div>
    

This is what goes on CSS:

    .horizontalStyle {
        display: flex;
        flex-direction: column;
    }
    
    .horizontal {
        width: 225px;
        height: 50px;
    }
    
    .white {
        background-color: white;
    }
    .blue {
        background-color: #0073cf;
    }
    .black {
      background-color: black;
  }