Edit in JSFiddle

<section class="show_levels">
  <div>$level: 1</div>
  <div>$level: 2</div>
  <div>$level: 3</div>
  <div>$level: 4</div> 
  <div>$level: 5</div>    
</section>


<h3>sample hover</h3>
<section class="show_hover">
  <div class="float">hover</div>
</section>

body {
  font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
  padding: 0;
  maring:0;
}
@mixin material-shadow($level: 1) {
  @if $level == 1 {
    box-shadow: 0 1px 3px rgba(0,0,0, 0.14), 0 1px 2px rgba(0,0,0,0.24);
  }
  @if $level == 2 {
    box-shadow: 0 3px 6px rgba(0,0,0, 0.16), 0 3px 6px rgba(0,0,0, 0.23);
  }  
  @if $level == 3 {
    box-shadow: 0 10px 20px rgba(0,0,0, 0.19), 0 6px 6px rgba(0,0,0, 0.23);
  }    
  @if $level == 4 {
    box-shadow: 0 15px 30px rgba(0,0,0, 0.25), 0 10px 10px rgba(0,0,0, 0.22);    
  }
  @if $level == 5{
    box-shadow: 0 20px 40px rgba(0,0,0, 0.30), 0 15px 12px rgba(0,0,0, 0.22);   
  }
}

.show_levels {
  padding: 40px;
  display:flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  align-items: center;
  margin: 20px;
  background: #f3f3f3; 
  div {
    font-size: 12px;
    background: #fff;
    padding: 50px;
    text-align: center;
    flex-basis: 100px;
    margin: 15px;  
    @include material-shadow(1);
  }
  :nth-child(1){ @include material-shadow(1); }
  :nth-child(2){ @include material-shadow(2); }
  :nth-child(3){ @include material-shadow(3); }
  :nth-child(4){ @include material-shadow(4); }
  :nth-child(5){ @include material-shadow(5); }
}


.show_hover {
  padding: 40px;
  display:flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  align-items: center;
  margin: 20px;
  background: #f3f3f3; 
  div {
    font-size: 12px;
    background: #fff;
    padding: 50px;
    text-align: center;
    flex-basis: 100px;
    margin: 15px;  
    transition:all 0.2s ease-in-out;
    cursor:pointer;
    @include material-shadow(1);
    &:hover{ @include material-shadow(3); }
  }
  
}