Ukraine flag tutorial

This is what goes on HTML:

    <div class="halfStyle"> 
        <div class="blue half"></div>
        <div class="yellow half"></div>
    </div>
    

This is what goes on CSS:

    .halfStyle {
        display: flex;
        flex-direction: column;
    }
    
    .half {
        width: 225px;
        height: 75px;
    }
    
    .blue {
        background-color: blue;
    }

    .yellow {
        background-color: yellow;
    }