Shapes with pointers

mnotermans5114

For a new reusable element i am working on, i want to use the shapes, specifically the 'Callout rounded'
As you can see here in a screenshot of a part of my page i do want my Callout's pointer to end small like
the image seen below it.  The top one is the shape... and i cannot control the endpoints on the shape...

Maybe Joe, @wheels knows a solution...Anyone else who can help is welcome too ;-)

CSS is an option offcourse, but not sure whether its visible for the SME in Lectora then... have to see...