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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <small>Enter message (optional) and click button "Send"</small>
<div class="wrapper centered">
  <article class="letter">
    <div class="side">
      <h1>Contact us</h1>
      <p>
        <textarea placeholder="Your message"></textarea>
      </p>
    </div>
    <div class="side">
      <p>
        <input type="text" placeholder="Your name" >
      </p>
      <p>
        <input type="email" placeholder="Your email" >
      </p>
      <p>
        <button id="sendLetter">Send</button>
      </p>
    </div>
  </article>
  <div class="envelope front"></div>
  <div class="envelope back"></div>
</div>
<p class="result-message centered">Thank you for your message</p>
            
          
!
            
              @use postcss-nested;
@import url(https://fonts.googleapis.com/css?family=Dancing+Script:400,700);
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  background-color: #c8e7d8;
  color: #4e5e72;
  text-align: center;
  font-family: monospace;
  overflow: hidden;
}
h1, p {
  margin: 0;
  padding: 0;
}
h1 {
  font-size: 2rem;
  font-family: 'Dancing Script';
}
small {
  display: block;
  padding: 1rem 0;
  font-size: 0.8rem;
  transition: opacity 0.33s;
}
textarea, input, button {
  line-height: 1.5rem;
  border: 0;
  outline: none;
  font-family: inherit;
  appearance: none;
}
textarea, input {
  color: #4e5e72;
  background-color: transparent;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='24'><rect fill='rgb(229, 225, 187)' x='0' y='23' width='10' height='1'/></svg>");
}
textarea {
 width: 100%;
 height: 8rem;
 resize: none;
}
input {
 width: 50%;
 margin-bottom: 1rem;
  &[type=text]:invalid, [type=email]:invalid {
    box-shadow: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='24'><rect fill='rgba(240, 132, 114, 0.5)' x='0' y='23' width='10' height='1'/></svg>");
  }
}
button {
 padding: 0.5rem 1rem;
 border-radius: 0.25rem;
 background-color: rgba(78, 94, 114, 0.9);
 color: white;
 font-size: 1rem;
 transition: background-color 0.2s;
  &:hover,:focus {
    outline: none;
    background-color: rgba(78, 94, 114, 1);
  }
}
input[type=text]:focus,
input[type=email]:focus,
textarea:focus {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='24'><rect fill='rgba(78, 94, 114, 0.3)' x='0' y='23' width='10' height='1'/></svg>");
  outline: none;
}
.wrapper {
  width: 35rem;
  background-color: white;
}
.letter {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  width: 30rem;
  margin: auto;
  perspective: 60rem;
}
.side {
  height: 12rem;
  background-color: #fcfcf8;
  outline: 1px solid transparent;
  &:nth-of-type(1) {
    padding: 2rem 2rem 0;
    border-radius: 1rem 1rem 0 0;
    box-shadow: inset 0 0.75rem 2rem rgba(229, 225, 187, 0.5);
  }
  &.side:nth-of-type(2) {
    padding: 2rem;
    border-radius: 0 0 1rem 1rem;
    box-shadow: 0 0.3rem 0.3rem rgba(0, 0, 0, 0.05), inset 0 -0.57rem 2rem rgba(229, 225, 187, 0.5);
    text-align: right;
  }
}
.envelope {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  margin: auto;
}
.envelope.front {
  width: 10rem;
  height: 6rem;
  border-radius: 0 0 1rem 1rem;
  overflow: hidden;
  z-index: 9999;
  opacity: 0;
}
.envelope.front::before, .envelope.front::after {
  position: absolute;
  display: block;
  width: 12rem;
  height: 6rem;
  background-color: #e9dc9d;
  transform: rotate(30deg);
  transform-origin: 0 0;
  box-shadow: 0 0 1rem rgba(0, 0, 0, 0.1);
  content: '';
}
.envelope.front::after{
  right: 0;
  transform: rotate(-30deg);
  transform-origin: 100% 0;
}
.envelope.back {
  top: -4rem;
  width: 10rem;
  height: 10rem;
  overflow: hidden;
  z-index: -9998;
  opacity: 0;
  transform: translateY(-6rem);
  &::before {
    display: block;
    width: 10rem;
    height: 10rem;
    background-color: #e9dc9d;
    border-radius: 1rem;
    content: '';
    transform: scaleY(0.6) rotate(45deg)
  }
}
.result-message {
  opacity: 0;
  transition: all 0.3s 2s;
  transform: translateY(9rem);
  z-index: -9999;
}
.sent {
  & .letter {
    animation: scaleLetter 1s forwards ease-in /*,
               pushLetter 0.5s 1.33s forwards ease-out*/ ;
  }
  & .side:nth-of-type(1) {
    transform-origin: 0 100%;
    animation: closeLetter 0.66s forwards ease-in;
  }
  & .side:nth-of-type(1) h1, .side:nth-of-type(1) textarea {
    animation: fadeOutText 0.66s forwards linear;
  }
  & button {
    background-color: rgba(78, 94, 114, 0.2);
  }
  & .envelope {
    animation: fadeInEnvelope 0.5s 1.33s forwards ease-out;
  }
  & .result-message {
    opacity: 1;
    transform: translateY(12rem);
  }
  & small {
    opacity: 0;
  }
}
.centered {
  position: absolute;
  left: 0;
  right: 0;
  margin: 1rem auto;
}
@keyframes closeLetter {
   50% {transform: rotateX(-90deg);}
   100% {transform: rotateX(-180deg);}
}
@keyframes fadeOutText {
   49% {opacity: 1;}
   50% {opacity: 0;}
   100% {opacity: 0;}
}
@keyframes fadeInEnvelope {
  0% {opacity: 0; transform: translateY(8rem);}
  /*90% {opacity: 1; transform: translateY(4rem);}*/
  100% {opacity: 1; transform: translateY(4.5rem);}
}
@keyframes scaleLetter {
  66% {transform: translateY(-8rem) scale(0.5, 0.5);}
  75% {transform: translateY(-8rem) scale(0.5, 0.5);}
  90% {transform: translateY(-8rem) scale(0.3, 0.5);}
  97% {transform: translateY(-8rem) scale(0.33, 0.5);}
  100%{transform: translateY(-8rem) scale(0.3, 0.5);}
}

/*
@keyframes pushLetter {
  0% {transform: translateY(-8rem) scale(0.3, 0.5);}
  50% {transform: translateY(-8rem) scale(0.3, 0.5);}
  90% {transform: translateY(-8.5rem) scale(0.3, 0.5);}
  100% {transform: translateY(-8rem) scale(0.3, 0.5);}
}
*/


            
          
!
            
              function addClass() {
  document.body.classList.add("sent");
}

sendLetter.addEventListener("click", addClass);
            
          
!
999px

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