Create bubble with CorelDraw

1. First, create a circle in CorelDraw using "Ellipse tool" then fill with white color from color palletes

2. Select the circle and make it transparent with "Transparency tool" then select the tranparency type with "Radial".

3. Create an ellipse using "Ellipse tool" then fill with white color from color palletes. After that, duplicate it and resize it become smaller.

4. Select the bubble and erase the line of bubble using outline width, choose the outline width none.
Now your bubble are finished.