tangentdesign on "How do I make these images fit? Ariel Theme"

Hey everyone! So I have my site, http://www.secondincomesurveys.com, I have it set up so that my posts show up on the front on the top of the page as you can see, but there is a weird gap that two of the pictures have, though all the pictures are roughly the same size 1000x 650x - Ive tried many sizes, very big, upwards up 3000, and even down to 400, they still have that gap, im wondering if and how i would go into CSS and fix that? I just want them all even haha

Go to Appearance > Editor and add this below css lines to css file:

.thumbnail-media{ width:100%; height:100%;}
.thumbnail-media a{ height:100%}
.thumbnail-media img{ height:100%; max-width:100%}