Actually you can use simple CSS with styling extensions like Stylus to achieve similar effect.<p><pre><code> .ind img {
height: 100%;
border-right: 3px solid red;
}
</code></pre>
If you want different color for different level of indent, just use attribute selector, like:<p><pre><code> .ind img {
height: 100%;
border-right: 3px solid;
}
img[width="40"] {
border-color: red;
}
img[width="80"] {
border-color: blue;
}</code></pre>