round explorer corners

[Spitzen]

Hi,

I tried to make the explorer corners round, like the original aero has it, too. But everytime the image deforms and looks realy ugly.
I've also seen several other visual styles, where it stays round like the image.

Hope you understand me and can explain me how to do this.

Thanks in advance
Spitzen

[Spitzen]

After chaning the contentmargins it is round