how to remove this black shadow from around a transparent texture

Support Materials and Textures
1

i have a transparent material for blush but the problem when i deselect it i get a black shadow around it i don’t know what the reason so how to remove this shadow in material mode ??
https://i.stack.imgur.com/niGl4.png
https://i.stack.imgur.com/RUQix.png

2

i founded the solution here https://blender.stackexchange.com/questions/92970/how-to-remove-this-black-shadow-from-around-a-transparent-texture