Attach div to the right of another div

I have a div which is like a container and inside of it there are 2 images. One image is on the left side of the div and the other is on the right. My container is Bootstrap's container

Both of them are wrapped with a div, and that div's position is fixed.

My problem is that I can't locate the right image to be attached to the right side of the conatiner. I tried the float and the right properties but they not give the expected result.

How can I attach div to the right of another div?

via Chebli Mohamed