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HTML 

              
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		s-0.9-1.6-1.5-2.2s-1.4-1.1-2.2-1.5S12.9,5,12,5c-1.8,0-3.3,0.6-4.6,1.7l2.9,2.9c0.1,0.1,0.2,0.3,0.1,0.6c-0.1,0.2-0.2,0.3-0.5,0.3
		H0.5c-0.1,0-0.3,0-0.4-0.1S0,10.1,0,10V0.5C0,0.3,0.1,0.1,0.3,0C0.5,0,0.7,0,0.9,0.1l3.7,3.8C5.6,3,6.7,2.3,8,1.8S10.6,1,12,1
		c1.5,0,2.9,0.3,4.3,0.9s2.5,1.4,3.5,2.3S21.5,6.4,22.1,7.7z"/>
</g>
</svg>
        Reset
      </a>
    </div>
    <p>The navigation is locked until the user activates it by agreeing to a condition or clicking an explicit 'unlock' button. This could be used to force a user to agree to terms before entering a system/site or encouraging somebody to read important text before continuing. That kind of shit.</p>
  </div>
</div>
!

CSS 

              
                @import: 'https://fonts.googleapis.com/css?family=Open+Sans:400,300,700,800';

@lightBG: #f7f7f7;
@grey: #efefef;
@blue: #6883a4;
@seaGreen: #699ca4;
@seaGreenLight: #8fd8e3;
@green: #69a478;
@greenLight: #98edad;
@gold: #a1a469;
@goldLight: #e8ed8c;
@rust: #a47769;
@rustLight: #e5a591;

@duration: .5s;
@unit: 100px;

body {
  background: @lightBG;
  font-family: 'Open Sans', sans-serif;
  margin: 0;
  padding: 0;
}


// navigation
div.nav {
  background: #fff;
  min-height: 80vh;
  padding: 10vh @unit;
  width: @unit;
}

div.dot {
  height: @unit;
  margin-bottom: 50px;
  width: @unit;
}

div.dot.seaGreen {
   div.btm div.flap div.flapFront {
       background: @seaGreen;
       svg {
         fill: @seaGreenLight;
       }
   }
  &.dropFlap {
    div.top {
       background: @seaGreen;
       svg {
         fill: @seaGreenLight;
       }
    }
  }
}

div.dot.green {
   div.btm div.flap div.flapFront {
       background: @green;
       svg {
         fill: @greenLight;
       }
   }
  &.dropFlap {
    div.top {
       background: @green;
       svg {
         fill: @greenLight;
       }
    }
  }
}

div.dot.gold {
   div.btm div.flap div.flapFront {
       background: @gold;
       svg {
         fill: @goldLight;
       }
   }
  &.dropFlap {
    div.top {
       background: @gold;
       svg {
         fill: @goldLight;
       }
    }
  }
}

div.dot.rust {
   div.btm div.flap div.flapFront {
       background: @rust;
       svg {
         fill: @rustLight;
       }
   }
  &.dropFlap {
    div.top {
       background: @rust;
       svg {
         fill: @rustLight;
       }
    }
  }
}

div.top div.pushDown svg {
  top: 25px !important;
}
div.btm div.pushDown svg {
  bottom: 25px !important;
}

div.top {
  background: darken(@grey, 10);
  border-radius: @unit @unit 0 0;
  height: 50%;
  width: 100%;
  perspective: 1000px;
  transform-style: preserve-3d;
  svg {
    display: block;
    left: 50%;
    position: absolute;
    top: 20px;
    height: 50px;
    transform: translateX(-50%);
  }
  &::before {
    background: rgba(0,0,0,.05);
    bottom: 0;
    content: "";
    height: 1px;
    width: 100%;
    position: absolute;
    z-index: 100;
  }
}
div.btm {
  background: @grey;
  border-radius: 0 0 @unit @unit;
  box-shadow: 0 2px 0 rgba(0,0,0,.1);
  height: 50%;
  width: 100%;
  perspective: 1000px;
  position: relative;
  transform-style: preserve-3d;
  &::before {
    background: rgba(255,255,255,.05);
    top: 0;
    content: "";
    height: 1px;
    width: 100%;
    position: absolute;
    z-index: 100;
  }
  div.flap {
    bottom: 0;
    position: absolute;
    height: 100%;
    width: 100%;
    svg {
      display: block;
      left: 50%;
      position: absolute;
      bottom: 60%;
      height: 100%;
      transform: translateX(-50%);
    }
    div.flapFront {
      background: @blue;
      bottom: 0;
      transform: rotateX(180deg);
      svg {
        bottom: 30px;
        height: 50px;
      }
    }
  }
}


div.flap {
  height: 100%;
  overflow: hidden;
  position: relative;
  div.flapFront {
    background: @grey;
    backface-visibility: hidden;
    border-radius: @unit;
    overflow: hidden;
    &::before {
        background: rgba(0,0,0,0);
        content: "";
        display: block;
        height: 100%;
        width: 100%;
    }
  }
}


div.flapFront {
  height: @unit;
  position: absolute;
  width: @unit;
  transition: all @duration ease-in;
}




div.dot.dropFlap {
  div.top {
    background: @blue;
    div.flapFront {
      animation: dropTop @duration forwards ease-in;
      &::before {
        animation: flapDarken @duration forwards ease-in;
      }
    }
  }
  div.btm {
    div.flapFront {
      animation: dropBtm @duration forwards ease-in;
      &::before {
        animation: flapLighten @duration forwards ease-in;
      }
    }
  }
}

@keyframes dropTop {
  0%   {
    transform: rotateX(0deg);
  }
  100% {
    transform: rotateX(-180deg);
  }
}
@keyframes dropBtm {
  0%   {
    transform: rotateX(180deg);
  }
  100% {
    transform: rotateX(0deg);
  }
}

@keyframes flapDarken {
  0%   {
    background: rgba(0,0,0,0);
  }
  100% {
    background: rgba(0,0,0,0.15);
  }
}

@keyframes flapLighten {
  0%, 50%   {
    background: rgba(255,255,255,.5);
  }
  100% {
    background: rgba(255,255,255,0);
  }
}


// content
div.content {
  padding-top: 10vh;
  position: absolute;
  left: 400px;
  right: 0;
  top: 0;
  h1 {
    color: #333;
    letter-spacing: -0.05em;
    margin-top: 0;
    font-size: 60px;
  }
  p {
    color: #999;
    font-size: 24px;
    font-weight: 300;
    padding-right: 100px;
    margin-bottom: 4em;
    max-width: 30em;
  }
  div.toggleButton {
    border-radius: 8px;
    background: @green;
    box-shadow: 0 2px 0 rgba(0,0,0,.1);
    display: inline-block;
    height: 68px;
    overflow: hidden;
    transition: all .2s ease-in;
    a {
      color: #fff;
      display: block;
      font-family: arial;
      font-size: 18px;
      font-weight: 700;
      padding: 18px 34px 21px;
      position: relative;
      text-decoration: none;
      text-transform: uppercase;
      width: 140px;
      transition: all .2s ease-in;
      svg {
        fill: @greenLight;
        margin-right: 10px;
        position: relative;
        top: 2px;
        width: 24px;
      }
    }
    a.reset {
      opacity: 0;
      svg {
        fill: @rustLight;
      }
    }
    &.showReset {
      background: @rust;
      a.flapit {
        margin-top: -68px;
        opacity: 0;
      }
      a.reset {
        opacity: 1;
      }
    }
  }
}
!

JS 

              
                $(document).ready(function(){
  $("a.flapit").click(function(){
    $('div.dot').each(function(i) {
    var $li = $(this);
    setTimeout(function() {
      $li.addClass('dropFlap');
      }, i*200); // delay 100 ms
    });
    $("div.toggleButton").addClass("showReset");
    return false;
  });
  $("a.reset").click(function(){
    $('div.dot').removeClass("dropFlap");
    $("div.toggleButton").removeClass("showReset");
  });
});
!
999px

Console