Hey @inspiring you should be able to do this with the current widgets using a sticky-top
class on the container. See below:
Create a regular html widget and then use the below markup in the container section
<div class="sticky-top" style="top: 1rem;">
<div class="card">
<h5 class="card-header">{{title}}</h5>
<div class="card-body">{{body}}</div>
</div>
</div>