Might have done it again, I've reuploaded them as JPG. 

I am doing that but the ad displays are being compressed and not filling the available block space. I've reattached the screenshots. 

So as I'm designing my site I've been referred to use the Penci Text Block for the homepage and PenNews Custom HTML for sidebar widgets when it comes to inserting ad code such as Adsense. 

I've found that my ad code is seeming to shrink a bit regardless of how implemented. I've attempted to insert the full script code, shortcode from PenNews' ads management, and shortcode from Advanced Ads, but they all seemingly seem to be getting downsized a bit despite being set to fixed dimensions. In a few ad examples I've even seen the banner get cut off by edges in downsizing. 

Additionally when there's a background enabled, there seems to be a decent bit of vacant margin surrounding the ad banner. I've got the values set to - as default. Without a background, the ad is still the same size but the margin is obviously not noted because it doesn't have contrast. 

Either way, implementation of ad code does not seem to take full advantage of the space allotted in the sidebar/homepage. Are there any solutions to get around such or am I doing something wrong?

My site is being redesigning in staging so I cannot share a live URL but have attached a few example images.