I noticed so images are bigger than their container instead of you tho resize or use width='' AND height='' it can also get bigger or smaller because it depend on the type of phone/pc you are using to view.
To save your stretch, and Scaled ur Image Proportionally...

Just add a rule that makes them. it go over their container.

img {
max-width: 90%;
/*Spans 90% in width of containing block*/

No matter how the Container is, it won't be bigger than It.