Here is an example of the default legend for a point layer colored red:
div class="omh-legend">
<div class="point" style="background-color: red">
</div>
<h3>{NAME}</h3>
</div>
Graduated Circles Example #1
In this example we are using the grid design from http://materializecss.com/grid.html which is the UI design library used by MapHubs and is automatically available.