如何使用嵌套元素建立帶有邊框的實心六邊形？

<code class="html"><div class="hex">
    <div class="hex inner">
        <div class="hex inner2"></div>
    </div>
</div></code>

<code class="css">.hex {
    /* Set width, height, fill color, and position */
}

.hex:before, .hex:after {
    /* Create triangular borders for the hexagon */
}</code>

<code class="css">.hex.inner {
    /* Scale the inner hexagon and set a new color */
}

.hex.inner:before, .hex.inner:after {
    /* Adjust triangle borders within the scaled hexagon */
}</code>

<code class="css">.hex.inner2 {
    /* Scale and color the second nested hexagon */
}

.hex.inner2:before, .hex.inner2:after {
    /* Set triangle borders within the second scaled hexagon */
}</code>