Shapes with pointers

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...

pointedshapes.jpg

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