Responsive space tourism website

The only thing I really had an issue with was when it came to wanting to use pseudo-classes in sass. I had two elements with the class called "technology-column", but when I only wanted to select the last technology-column, it was still selecting both of the div's with the class. I thought I understood the usage, but any feedback on this would be helpful!

Here's what I mean:

.technology-container {
   .technology-column:last-child { // eveything inside 
was still selecting the first-child with the div technology-column }
}