To get a yellow circle round your pointer on RealWorld Cursor Editor.
Download the Cursor Editor
Step 1:
Create a custom cursor: edit Arrow head, tail length, outline width and outline Colour.
Step 2:
Draw a circle round the cursor. The choose the desired colour highlights on the cursor.
Step 3:
Save the created Cursor on your PC. Preferably in a folder that is easily accessible.
Step 4:
So the next step is to replace the default mouse from settings. From menu, select "Change the mouse pointer display or view"
Step 5:
On the Pointers tab, browse and add your newly created Cursor.