<div class="sign-up-container">
  <div class="envelope">
    <div class="paper">
      <h1>Subscribe our Newslatter</h1>
      <form class="sign-up-form">
        <input type="text" placeholder="Email" class="text-input"/>
        <button type="submit" class="button">Sign up</button>
      </form>
    </div>
    <div class="bottom-flap"></div>
  </div>
  <div class="thanks-text"> <span>Thanks for subscribing</span></div>
</div>

body {
  font-size: 26px;
}

body {
  background-color: #fff;
}

.sign-up-container {
  width: 100%;
  padding-top: 208.33333px;
  font-family: 'Source Sans Pro', sans-serif;
  font-weight: 300;
}

.paper {
  width: 85%;
  box-sizing: border-box;
  margin: 0 auto;
  position: relative;
  top: -145px;
  padding: 1rem 1.4rem 125px 1.4rem;
  background: #fff;
  background: -webkit-linear-gradient(top, #f1f1f1 43%, #fff 100%);
  background: linear-gradient(to bottom, #f1f1f1 43%, #eee2b4 100%);
  color: #db4344;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

h1 {
  margin-bottom: 1rem;
  margin-top: 0;
  text-align: center;
  font-size: 1em;
  font-weight: 300;
}

.text-input,
.button {
  box-sizing: border-box;
  padding: 0.8em 0.67em;
  margin-bottom: 0.5rem;
  background: transparent;
  border: none;
  border-radius: 2em;
  outline: none;
}

.button {
  border: 1px solid #999;
  -webkit-transition: background 0.1s, color 0.1s;
  transition: background 0.1s, color 0.1s;
}
.button:hover {
  background: #db4344;
  color: #fef8e1;
}

.text-input {
  background: #fff;
    color: #333;
}
.text-input::-webkit-input-placeholder {
  color: inherit;
  font-style: italic;
}
.text-input::-moz-placeholder {
  color: inherit;
  font-style: italic;
}
.text-input:-ms-input-placeholder {
  color: inherit;
  font-style: italic;
}
.text-input::placeholder {
  color: inherit;
  font-style: italic;
}

.sign-up-form {
  width: 100%;
}
.sign-up-form * {
  width: 100%;
}

.envelope {
  position: relative;
  width: 400px;
  height: 250px;
  margin: 0 auto;
  background: #fa5b5c;
  border-radius: 24px;
}
.envelope:before {
  content: '';
  display: block;
  position: absolute;
  top: -240px;
  width: 0;
  height: 0;
  z-index: -1;
  border-width: 125px 200px;
  border-color: transparent;
  border-style: solid;
  border-bottom-color: #fa5b5c;
  border-radius: 24px;
}
.envelope:after {
  content: '';
  display: block;
  position: absolute;
  bottom: 0;
  width: 0;
  height: 0;
  pointer-events: none;
  border-width: 125px 200px;
  border-style: solid;
  border-color: #db4344;
  border-top-color: transparent;
  border-radius: 24px;
}
.envelope .bottom-flap {
  width: 400px;
  height: 250px;
  display: block;
  position: absolute;
  top: 0;
  z-index: 1;
  border-radius: 24px;
  overflow: hidden;
  pointer-events: none;
}
.envelope .bottom-flap:after {
  content: '';
  display: block;
  position: absolute;
  width: 400px;
  height: 400px;
  top: 40%;
  border-radius: 24px;
  background: #fa5b5c;
  -webkit-transform: scaleY(0.7) rotate(45deg);
          transform: scaleY(0.7) rotate(45deg);
  box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.1);
}

.thanks-text {
  position: absolute;
  width: 100%;
  top: 250px;
  z-index: -1;
  text-align: center;
  font-weight: 400;
}

.submitted .paper {
  -webkit-animation: paper-in 0.8s ease-out;
          animation: paper-in 0.8s ease-out;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}
.submitted.sign-up-container {
  overflow: hidden;
}
.submitted .envelope {
  -webkit-animation: fly-away 0.5s ease-in;
          animation: fly-away 0.5s ease-in;
  -webkit-animation-delay: 1.3s;
          animation-delay: 1.3s;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}
.submitted .envelope:before {
  -webkit-animation: fold 0.5s ease-in;
          animation: fold 0.5s ease-in;
  -webkit-animation-delay: 0.7s;
          animation-delay: 0.7s;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}

@-webkit-keyframes paper-in {
  30% {
    -webkit-transform: translateY(-80px);
            transform: translateY(-80px);
    padding-bottom: 125px;
  }
  to {
    top: 10px;
    padding-bottom: 0;
  }
}

@keyframes paper-in {
  30% {
    -webkit-transform: translateY(-80px);
            transform: translateY(-80px);
    padding-bottom: 125px;
  }
  to {
    top: 10px;
    padding-bottom: 0;
  }
}
@-webkit-keyframes fly-away {
  to {
    -webkit-transform: translateX(200%) rotate(10deg);
            transform: translateX(200%) rotate(10deg);
    opacity: 0;
  }
}
@keyframes fly-away {
  to {
    -webkit-transform: translateX(200%) rotate(10deg);
            transform: translateX(200%) rotate(10deg);
    opacity: 0;
  }
}
@-webkit-keyframes fold {
  from {
    -webkit-transform-origin: bottom center;
            transform-origin: bottom center;
    z-index: 10;
  }
  to {
    z-index: 10;
    -webkit-transform-origin: bottom center;
            transform-origin: bottom center;
    -webkit-transform: rotateX(-180deg) translateY(10px);
            transform: rotateX(-180deg) translateY(10px);
    border-bottom-color: #5eb6e0;
  }
}
@keyframes fold {
  from {
    -webkit-transform-origin: bottom center;
            transform-origin: bottom center;
    z-index: 10;
  }
  to {
    z-index: 10;
    -webkit-transform-origin: bottom center;
            transform-origin: bottom center;
    -webkit-transform: rotateX(-180deg) translateY(10px);
            transform: rotateX(-180deg) translateY(10px);
    border-bottom-color: #fa5b5c;
  }
}
.reset-button {
  display: block;
  padding: 0.6em 1em;
  margin-top: 50px;
  margin-left: auto;
  margin-right: auto;
  font-size: 12px;
  background: transparent;
  border: 1px solid black;
}
.reset-button:hover {
  color: white;
  background: black;
}

$(document).ready(function() {
	$('.sign-up-form').on('submit', submit);
	$('.reset-button').on('click', reset);
});

function submit(e) {
	$('.sign-up-container').addClass('submitted');
	e.preventDefault();
}

function reset() {
	$('.sign-up-container').removeClass('submitted');
	$('.sign-up-form')[0].reset();
}