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HTML

CSS

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HTML Settings

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.

HTML

              
                <section class="container">
  <div class="container-inner">
    <form action="" class="sign-up">
      <label class="sign-up__label" for="email">Your email</label>
      <input type="email" class="sign-up__input-box" id="email" placeholder="youremail@example.com" required>
      <button class="sign-up__btn">Sign Me Up!</button>
    </form>
    <div class="sign-up__loader" aria-label="loading"> 
    </div>
    <div class="sign-up__success" aria-label="success">
      <span class="sign-up__success-icon">✔</span> 
    </div>
  </div>
</section>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}

*::before,
*::after {
  box-sizing: inherit;
}

html, body {
  width: 100%;
  height: 100%;
  background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/234228/about-bg.jpg') no-repeat center center;
  background-size: cover;
}

html {
  font-size: 100%;
  line-height: 1.5;
}

.container {
  width: 100%;
  height: 100%;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
}

.container-inner {
  position: relative;
  width: 100%;
  height: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  background-color: rgba(161, 66, 244, .8);
}

.sign-up {
  display: block;
  border: 1px solid #2a034c;
  padding: 1em;
}

.sign-up__label {
  color: white;
  font-size:1.625rem;
  letter-spacing: 1px;
}

.sign-up__input-box {
  padding: 10px;
  margin-right: 5px;
  margin-bottom: 1.5em;
  font-size: 1.5em;
  color: #444;
}

.sign-up__input-box:focus {
  border: 2px solid #2d055e;
}

.sign-up__btn {
  padding: 1em;
  margin: 0 auto 0.6em;
  outline: 0;
  text-transform: uppercase;
  font-weight: bold;
  text-align: center;
  vertical-align: middle;
  letter-spacing: 1px;
  color: #842def;
  background-color: #e0dc06;
  border-color: #9b9906;
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.5s,
              color 0.5s,
              background-color 0.5s;
}

.sign-up__btn:focus,
.sign-up__btn:hover {
  color: #fff;
  border-color: #3f3e01;
  background-color: #827f02;
}

.sign-up__success {
  position: absolute;
  left: calc(50% - 50px);
  top: calc(50% - 50px);
  margin: auto;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: #e0dc06;
  text-align: center;
  color: green;
  font-size: 50px;
  font-weight: bold;
  line-height: 100px;
  display: none;
}

.sign-up__loader {
  position: absolute;
  left: calc(50% - 60px);
  top: calc(50% - 60px);
  margin: auto;
  border: 16px solid #ae8ace; /* light purple */
  border-top: 16px solid #e0dc06; /* yellow */
  border-radius: 50%;
  width: 120px;
  height: 120px;
  animation: rotate 2s linear infinite;
  display: none;
}

/* Loader animation */
@keyframes rotate {
  100% { transform: rotate(360deg); }
}



              
            
!

JS

              
                //Hides loader after success icon appears
const hideLoader = (loaderEl) => {
  Velocity(loaderEl, 'transition.fadeOut', 1000);
};

//hides form after successful submission
const hideForm = (formEl, iconEl, loaderEl) => {
  Velocity(formEl,'transition.bounceUpOut', 500);
  Velocity(loaderEl, 'transition.fadeIn');
  //Simulate the time it takes to process the form
  const timer = setTimeout( () => {
   Velocity(iconEl, 'transition.bounceDownIn', 500);
  }, 2000);
  hideLoader(loaderEl);
};

//Caching reference to elements
const signButton = document.querySelector('.sign-up__btn'),
      signForm = document.querySelector('.sign-up'),
      success = document.querySelector('.sign-up__success'),
      loader = document.querySelector('.sign-up__loader');

//Handler for sign up button
signButton.addEventListener('click', (e) => {
  e.preventDefault();
  hideForm(signForm, success, loader); 
});
              
            
!
999px

Console