us: 20px 0 0 0;</div>
        <div>border-radius: 0 20px 0 0;</div>
        <div>border-radius: 0 0 20px 0;</div>
        <div>border-radius: 0 0 0 20px;</div>

        <h2>X and Y</h2>
        <div>border-radius: 30px / 10px;</div>
        <div>border-radius: 3em / 1em;</div>
        <div>border-radius: 20% / 50%;</div>
        <div>border-radius: 5px 10px 15px 20px / 20px 15px 10px 5px;</div>

        <h2>Uniform with border</h2>
        <div>border-radius: 10px; border: 5px solid #000;</div>
        <div