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HTML

              
                <div class="Container">
  <div class="Subscribe">
    <h3>Subscribe to our newsletter</h3>
    <p>Weekly animation tutorials delivered straight to your inbox</p>
    <form action="#">
      <input type="text" placeholder="Email Address" />
      <button>Subscribe</button>
    </form>
    <div class="Loading">
      <div class="LoadingDot"></div>
      <div class="LoadingDot"></div>
      <div class="LoadingDot"></div>
      <div class="LoadingDot"></div>
      <span>Subscribing</span>
    </div>
    <div class="Complete">
      <div class="Tick">

        <svg width="32px" height="25px" viewBox="0 0 32 25">
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Artboard" transform="translate(-384.000000, -217.000000)" fill-rule="nonzero" fill="#FFFFFF">
            <g id="Group" transform="translate(360.000000, 189.000000)">
                <path d="M27.4142136,40.5857864 C26.633165,39.8047379 25.366835,39.8047379 24.5857864,40.5857864 C23.8047379,41.366835 23.8047379,42.633165 24.5857864,43.4142136 L34,52.8284271 L55.4142136,31.4142136 C56.1952621,30.633165 56.1952621,29.366835 55.4142136,28.5857864 C54.633165,27.8047379 53.366835,27.8047379 52.5857864,28.5857864 L34,47.1715729 L27.4142136,40.5857864 Z" id="Path-2"></path>
            </g>
        </g>
    </g>
</svg>
      </div>
      <h4>Thank you for subscribing</h4>
      <span>You will receive a confirmation email shortly</span>
    </div>
  </div>
  <small>This form is an animation demo and will not store any provided data.</small>
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans:400,600');

body, html {
  height: 100%;
  font-family: 'Open Sans', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #F5F3F9;
}


.Container {
  width: 360px;
}

.Subscribe {
  height: 250px;
  padding: 30px;
  overflow: hidden;
  position: relative;
  border-radius: 6px;
  margin-bottom: 20px;
  background-color: white;
  box-shadow: 0 6px 10px 0 rgba(149,144,179,0.15),
    0 15px 50px 0 rgba(182,182,224,0.10);
}

.Subscribe::after {
  width: 150%;
  height: 130px;
  content: "";
  z-index: 1;
  position: absolute;
  bottom: -20px;
  left: -25%;
  transform: rotate(-5deg);
  background-color: #F9F9FC;
  transition: transform 1s cubic-bezier(0.2, 0, 0, 1);
}

.Subscribe h3 {
  color: #4F20FF;
  font-size: 22px;
  margin-bottom: 15px;
  transition: opacity 900ms 150ms cubic-bezier(0.2, 0, 0, 1), transform 900ms 150ms cubic-bezier(0.2, 0, 0, 1);
}

.Subscribe p {
  color: #827C8C;
  font-size: 15px;
  line-height: 24px;
  margin-bottom: 30px;
  transition: opacity 900ms 100ms cubic-bezier(0.2, 0, 0, 1), transform 900ms 100ms cubic-bezier(0.2, 0, 0, 1);
}

.Subscribe form {
  z-index: 2;
  left: 20px;
  width: 320px;
  height: 46px;
  bottom: 25px;
  overflow: hidden;
  position: absolute;
  border-radius: 4px;
  background: #FFFFFF;
  box-shadow: 0 3px 6px 0 rgba(149,144,179,0.20);
  transition: transform 600ms cubic-bezier(0.2, 0, 0, 1);
}

.Subscribe form::after {
  top: 0;
  content: "";
  width: 30px;
  height: 100%;
  right: 110px;
  position: absolute;
  background: linear-gradient(90deg, rgba(white, 0), rgba(white, 1))
}

.Subscribe form input[type=text] {
  border: none;
  width: 100%;
  height: 100%;
  outline: none;
  font-size: 15px;
  padding: 0 110px 0 20px;
  font-family: 'Open Sans', sans-serif;
}

.Subscribe form button {
  top: 0;
  right: 0;
  padding: 0;
  cursor: pointer;
  outline: none;
  width: 110px;
  border: none;
  height: 100%;
  color: #5224FF;
  font-size: 15px;
  position: absolute;
  background-color: white;
  transition: color 500ms;
  &:hover { color: #1A0373; }
}

.Loading {
  left: 0;
  opacity: 0;
  z-index: 0;
  width: 100%;
  bottom: 50px;
  position: absolute;
  text-align: center;
  potiner-events: none;
  transition: opacity 900ms 0s cubic-bezier(0.2, 0, 0, 1), transform 900ms 0s cubic-bezier(0.2, 0, 0, 1);
  
  .LoadingDot {
    width: 6px;
    opacity: 0;
    height: 6px;
    margin: 0 1px;
    border-radius: 50%;
    display: inline-block;
    background-color: #B6B6CF;
  }
  
  .LoadingDot:nth-child(1) {
    animation: loading 2s 0ms infinite;
  }
  
  .LoadingDot:nth-child(2) {
    animation: loading 2s 200ms infinite;
  }
  
  .LoadingDot:nth-child(3) {
    animation: loading 2s 400ms infinite;
  }
  
  .LoadingDot:nth-child(4) {
    animation: loading 2s 600ms infinite;
  }
  
  span {
    color: #B6B6CF;
    display: block;
    font-size: 12px;
    margin-top: 15px;
  }
}

@keyframes loading {
  0% { opacity: 0; transform: scale(0.5) }
  33% { opacity: 1; transform: scale(1) }
  66% { opacity: 0; transform: scale(0.5)}
}

.Complete {
  left: 0;
  top: 50px;
  width: 100%;
  padding: 0 30px;
  text-align: center;
  position: absolute;
  
  .Tick {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 30px;
    display: inline-block;
    background-color: #4F20FF;
    
    svg {
      opacity: 0;
      margin-top: 28px;
      transform: scale(0.5);
      transition: opacity, 400ms 500ms, transform 300ms 500ms cubic-bezier(0.2, 0, 0, 1.2);
    }
    
    opacity: 0;
    transform: scale(.5);
    transition:
      opacity 600ms 200ms,
      transform 600ms 200ms;
  }
  
  h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
    opacity: 0;
    transform: translateY(-15px);
    transition:
      opacity 600ms 450ms,
      transform 600ms 450ms;
  }
  
  span {
    opacity: 0;
    color: #827C8C;
    display: block;
    font-size: 14px;
    transform: translateY(-15px);
    transition:
      opacity 600ms 400ms,
      transform 600ms 400ms;
  }
}

// loading state
.Subscribe--loading,
.Subscribe--complete {
  form { transform: translateY(100px) }
  &::after {
    transform: rotate(0) translateY(100px);
  }
  .Loading {opacity: 1; pointer-events: all }
}

.Subscribe--complete {
  .Loading { opacity: 0; transform: translateY(100px) }
  h3 { transform: translateY(100px); opacity: 0; }
  p { transform: translateY(100px); opacity: 0; }
  .Complete .Tick {
    opacity: 1;
    transform: scale(1);
  }
  .Complete .Tick svg {
    opacity: 1;
    transform: scale(1);
  }
  .Complete h4,
  .Complete span {
    opacity: 1;
    transform: translateY(0);
  }
}

.Container small {
  width: 100%;
  display: block;
  color: #B6B6CF;
  font-size: 14px;
  padding: 0 30px;
  line-height: 22px;
  text-align: center;
}
              
            
!

JS

              
                const s = document.querySelector('.Subscribe')
const b = document.querySelector('button')
b.addEventListener('click', (e) => {
  e.preventDefault()
  s.classList.toggle('Subscribe--loading')
  setTimeout(() => {
     s.classList.remove('Subscribe--loading')
     s.classList.toggle('Subscribe--complete')
  }, 2000)
  
  setTimeout(() => {
     s.classList.remove('Subscribe--complete')
  }, 5000)
})

class Subscribe extends React.Component {
  render() {
    return (
      <div>Subscribe</div>
    )
  }
}

// ReactDOM.render(
//   <Subscribe />,
//   document.getElementById('subscribe')
// )
              
            
!
999px

Console