.button
  each b in [1,2]
    .hex
      each h in [1,2,3] 
        div

// Hexagon
$sqrt3: 1.7320508075688772;
$edgeSize: 100px;
$hexWidth: $edgeSize * 2;
$hexHeight: $sqrt3 * $edgeSize;

// Display
$borderHover: 15px;
$soft-white: rgba(255,255,255,1);

// Easing
$ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
$ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);

body {
  background: #151515;
  margin-top: 100px;
}

.button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%,-50%,0) rotate(30deg);
}
/* End of container */

// Contains 2 hexagons (.hex)
.button {
  cursor: pointer;
  width: $hexWidth;
  height: $hexHeight;
  float: left;
  
  &:last-child {
    margin-right: 0;
  }

  // Hover state
  &:hover {
    .hex:last-child {
      opacity: 1;
      transform: scale(1.3);
    }
    .hex:first-child {
      opacity: 1;
      
      div:before, div:after {
        height: $borderHover;
      }
      
      transform: scale(1.2);
    }
  }
}

// Contains 3 div that makes the hexagon
.hex {
  position: absolute;
  top: 0;
  left: $edgeSize/2;
  width: $edgeSize;
  height: $hexHeight;
  opacity: 0.5;
  
  // Inset
  &:first-child {
    transform: scale(0.9);
    transition: all 0.3s $ease-out-quart;
    z-index: 0;
  }
  
  // Outset
  &:last-child {
    transition: all 0.3s $ease-out-expo;
    z-index: 1;
  }
  
  div {
    box-sizing: border-box;
    position: absolute;
    top: 0;
    width: $edgeSize;
    height: $hexHeight;
    
    &:before, &:after {
      content: ' ';
      position: absolute;
      background: $soft-white;
      width: 100%;
      height: 1px;
      
      transition: height 0.3s $ease-out-quart;
    }
    &:before {
      top: 0;
    }
    &:after {
      bottom: 0;
    }
    &:nth-child(1) {
      transform: rotate(0deg);
    }
    &:nth-child(2) {
      transform: rotate(60deg);
    }
    &:nth-child(3) {
      transform: rotate(120deg);
    }
    
    transform-origin: center center;
  }
}