<div class="container">
   <header>
     <h1>Smiles!</h1>
     <p>Change the viewport size. This page is responsive without using the width media query!</p>
   </header>
   <main>

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->
     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->
     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->
     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->
     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->
     <div class="card">
       <input type="checkbox" />
       <div class="img"></div>
     </div>
     <!-- /card -->

   </main>
 </div>
 <!-- /container -->

@import url("https://fonts.googleapis.com/css?family=Overpass:200,400,700");

body,
html {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Overpass", sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

.container {
  @media (orientation: landscape) {
    display: grid;
    grid-template-columns: minmax(250px, 1fr) 4fr;
  }
}

header {
  background: #393f44;
  padding: 3rem 2rem;
  color: white;

  a {
    color: #fafafa;
  }

  h1 {
    margin: 0 0 1rem 0;
    font-size: 2.25rem;
  }

  p {
    font-weight: 300;
    font-size: 0.8rem;
  }
}

main {
  background: #fff;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  grid-gap: 0.25rem;
  padding: 1rem;
}

// Card styles
.card {
  min-height: 4em;
  background-color: white;
  position: relative;
  transition: 0.2s transform ease-in-out;

  &:hover {
    transform: scale3d(1.2, 1.2, 1) rotate(5deg);
    z-index: 2;
    box-shadow: 0 0.2rem 1rem -0.2rem rgba(0, 0, 0, 0.5);
  }

  &:nth-child(4n-7):hover {
    transform: scale3d(1.2, 1.2, 1) rotate(-5deg);
  }

  &:nth-child(3n-7):hover {
    transform: scale3d(1.2, 1.2, 1) rotate(-3deg);
  }

  &:nth-child(5n-7):hover {
    /* or 4n+1 */
    transform: scale3d(1.2, 1.2, 1) rotate(3deg);
  }
}
.img {
  width: 100%;
  height: 10rem;
  background: grey;
  display: block;
}
/* This is where the magic happens */
input[type="checkbox"] {
  position: absolute;
  top: 1rem;
  left: 1rem;
}

@media (pointer: coarse) {
  input[type="checkbox"] {
    height: 2em;
    width: 2em;
  }
}

/* Use z-index to make it accessible to keyboard navigation */
@media (hover: hover) {
  input[type="checkbox"] {
    z-index: -1;
  }

  .card:hover input[type="checkbox"],
  input[type="checkbox"]:focus,
  input[type="checkbox"]:checked {
    z-index: auto;
  }
}


// Eliminates animations on cards
@media screen and (prefers-reduced-motion: reduce) {  
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}