1- Open Canva and select your design size.
2- Your design space will appear in a new window. Click on the shapes icon.
3- Pick the shape you would like to create a glow effect on.
4- With the shape selected click on the colour picker and change the colour of your shape.
5- Copy your shape.
6- Click on the copied icon and then the transparency, adjust to 80%
7- Resize the shape so it is a little bigger than the previous circle. Copy the 80% transparency shape.
8- The new shape can be adjusted to 60% transparency.
9- Resize to slightly larger than the previous shape. Repeat another time this time with 40% transparency and larger again than the previous shape.
10- Select all of the shapes and group. Your glow effect will show up clearer over dark backgrounds.