Jagged Edges Around imported png on cube game object

I'm making a button using a cube that I put a png picture on. I parent the cube to the camera, and have it about a distance of 1 in the z direction from the camera. However, the image appears to have jagged lines around the edges. I've set the import settings to Format "Truecolor" and the Wrap Mode to "Clamp," as has been recommended by people on the forum. I'm still experiencing the poor image quality problem though, even after experimenting with different sizes like 200x200 or 64x64

The image that I'm using was made in illustrator using the "Save for Web and Devices" option. The graphic seems to have the jagged edge problem in unity whether I keep a stroke of 1 on it or not. The format is a png. The first pic is a screenshot from unity. The second is the original