Use mobile first break points

[salatielsql]

I like to develop with min-width instead of max-width. We can focus on mobile first like this:

.element {
  /* mobile styles */
  @media (min-width: 575px) {
    /* tablet styles */
  }
  @media (min-width: 768px) {
    /* desktop styles */
  }
}

Just an opinion here.

Originally posted by @caian-gums in #4