Animation Open Envelope

animation-open-envelope.markdown

index.html

<div class="envelope new">
  <div class="front">
    <div class="mailme">
      <p>Resultado Final</p>
      <p>clique para exibir</p>
    </div>
  </div>
  <div class="back">
    <div class="letter">
       
    </div>
    <div class="flap left-flap"></div>
    <div class="flap right-flap"></div>
    <div class="flap bottom-flap"></div>
    <div class="flap top-flap"></div>
  </div>
</div>

script.js

$(function(){

  if (!$('.envelope').hasClass('open')){
    $('.envelope').click(function(){
      $(this).removeClass('new').addClass('open');
    });
  }
  
});
 

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

style.css

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

@keyframes open {
  0% {
    transform: translate3d(0, 0, 0) rotateY(0);
  }
  33.333% {
    transform: translate3d(-100%, 0, 0) rotateY(-180deg);
  }
  66.666% {
    transform: translate3d(-100%, 0, 0) rotateY(-180deg);
  }
  100% {
    transform: translate3d(-100%, 0, 0) rotateY(-180deg);
  }
}

body, html {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  background-color: #2b43ea;
  position: relative;
  perspective: 800px;
  overflow: hidden;
}

.envelope {
  z-index: 2;
  position: absolute;
  width: 550px;
  height: 366.66667px;
  top: 50%;
  left: 50%;
  margin-top: -183.33333px;
  margin-left: -275px;
  transform-style: preserve-3d;
  transform-origin: right center;
  transition: transform 1s ease;
  font-family: "Allan", sans-serif;
  color: #1F1F1F;
}
.envelope .front, .envelope .back {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #FFF;
  border-radius: 5px;
  box-shadow: inset 0 0 30px -5px #a87e50, 0 0 20px -5px;
}
.envelope .front {
  backface-visibility: hidden;
  cursor: pointer;
  display: table;
}
.envelope .front:focus {
  outline: none;
}

.envelope .front .mailme {
  text-align: center;
  display: table-cell;
  vertical-align: middle;
}
.envelope .front .mailme p {
  font-weight: bold;
  margin: 0;
}
.envelope .front .mailme p:first-child {
  font-size: 50px;
  line-height: 50px;
}
.envelope .front .mailme p:last-child {
  font-size: 30px;
}
.envelope .back {
  transform: rotateY(180deg) translate3d(0, 0, 1px);
}
.envelope .back .flap {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.envelope .back .flap:before {
  content: "";
  position: absolute;
  background-color: #FFF;
  box-shadow: inset 0 0 30px -7px #a87e50;
}
.envelope .back .top-flap:before, .envelope .back .bottom-flap:before {
  width: 388.90873px;
  height: 388.90873px;
}
.envelope .back .top-flap {
  z-index: 5;
  transform-origin: top center;
}
.envelope .back .top-flap:before {
  transform-origin: top left;
  transform: rotate(-45deg);
  border-bottom-left-radius: 50px;
  border-top-left-radius: 10px;
  border-bottom-right-radius: 10px;
}
.envelope .back .bottom-flap {
  z-index: 4;
}
.envelope .back .bottom-flap:before {
  transform-origin: left bottom;
  transform: rotate(45deg) translate(-15px, -15px);
  border-top-left-radius: 100px;
  border-bottom-left-radius: 10px;
  border-top-right-radius: 10px;
}
.envelope .back .left-flap:before, .envelope .back .right-flap:before {
  width: 269.27249px;
  height: 269.27249px;
  top: -5px;
}
.envelope .back .left-flap {
  z-index: 3;
}
.envelope .back .left-flap:before {
  transform-origin: top left;
  transform: rotate(45deg);
  border-top-left-radius: 20px;
  border-bottom-right-radius: 30px;
  border-top-right-radius: 5px;
}
.envelope .back .right-flap {
  z-index: 2;
}
.envelope .back .right-flap:before {
  right: 0;
  transform-origin: top right;
  transform: rotate(-45deg);
  border-top-right-radius: 20px;
  border-bottom-left-radius: 30px;
  border-top-left-radius: 5px;
}

.envelope .back .letter textarea {
  resize: none;
  height: 117.66667px;
}

.envelope.open {
  animation: open 3s forwards;
}
.envelope.open .top-flap {
  animation: flap-open 1s 1s forwards;
}
.envelope.open .letter {
  animation: letter-out 1s 2s forwards;
}