Belgium Flag Tutorial

This is what goes on HTML:

    <div>
        <div class="black vertical"></div>
        <div class="yellow vertical"></div>
        <div class="red vertical"></div>
    </div>
    

This is what goes on CSS:

    .vertical {
        width: 75px;
        height: 150px;
        float: left;
    }
    
    .black {
        background-color: black;
    }
    .red {
        background-color: red;
    }
    .yellow {
        background-color: yellow;
    }