Responsive
            Responsive shows or hides elements depending on the size of the screen.
| Class | Properties | 
|---|---|
  .is-only-mobile
 | 
  @media #{$break2open} { display: none!important; }
 | 
  .is-only-tablet
 | 
  @media #{$break1}, #{$break3open} { display: none!important; }
 | 
  .is-only-desktop
 | 
  @media #{$break1}, #{$break2} { display: none!important; }
 | 
  .is-not-mobile
 | 
  @media #{$break1} { display: none!important; }
 | 
  .is-not-desktop
 | 
  @media #{$break3open} { display: none!important; }
 | 
I’m visible on mobile
I’m visible on tablets
I’m visible on desktop
I’m visible on tablets & desktops
I’m visible on mobile & tablets
      <p class="is-only-mobile">I’m visible on mobile</p>
      <p class="is-only-tablet">I’m visible on tablets</p>
      <p class="is-only-desktop">I’m visible on desktop</p>
      <p class="is-not-mobile">I’m visible on tablets & desktops</p>
      <p class="is-not-desktop">I’m visible on mobile & tablets</p>