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CSS

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HTML 

              
                <picture class="nps screenshot">
	<source media="(min-width: 414px)" srcset="https://picsum.photos/1080/720">
	<img src="https://picsum.photos/seed/picsum/500/300">
</picture>

<div class="nps formContainer transitionOut">
	<form class="nps form">
		<img class="nps coverImage" src="https://picsum.photos/seed/picsum/500/200" />
		<h1 class="nps h1">Tell us what you think</h1>
		<h2 class="nps h2">How satisfied are you with Redbubble, today?</h2>
		<div class="nps scaleDescription">
			<span><i>💩</i> Not satisfied</span>
			<span><i>❤️</i> Very satisfied</span>
		</div>
		<div class="nps scale">
			<input class="nps input" name="number" type="radio" id="one" />
			<label class="nps label" for="one">1</label>
			<input class="nps input" name="number" type="radio" id="two" />
			<label class="nps label" for="two">2</label>
			<input class="nps input" name="number" type="radio" id="three" />
			<label class="nps label" for="three">3</label>
			<input class="nps input" name="number" type="radio" id="four" />
			<label class="nps label" for="four">4</label>
			<input class="nps input" name="number" type="radio" id="five" />
			<label class="nps label" for="five">5</label>
		</div>
		<h3 class="nps h3">Tell us why?</h3>
		<textarea class="nps textarea" rows="5" placeholder="Placeholder"></textarea>
		<label class="nps textareaLabel">
			<input type="checkbox" />
			Rebubble may contact me about my feedback.
		</label>
		<div class="nps actions">
			<a class="nps close">Cancel</a>
			<a class="nps button">Submit</a>
		</div>
	</form>
</div>
<a class="nps floatingActionButton">🎤 Feedback</a>
!

CSS 

              
                * {
  box-sizing: border-box;
  position: relative;
  margin: 0;
  padding: 0;
}

html {
  width: 100%;
  min-height: 100%;
  font-size: 14px;
}
@media (min-width: 321px) {
  html {
    font-size: 16px;
  }
}

body {
  min-height: 100%;
  font-size: 1rem;
  font-family: sans-serif;
}

.page {
  display: flex;
  flex-direction: column;
}

.artboards {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}

.artboardTitle {
  font-size: 1rem;
  font-weight: bold;
  margin: 1rem 0;
}

.artboard {
  display: flex;
  flex-direction: column;
  margin: 1rem;
}

.screen {
  background-color: white;
  border: 1px solid black;
  background-color: #ECEFF1;
}
.screen.iPhone4 {
  width: 320px;
  height: 480px;
}
.screen.iPhone5 {
  width: 320px;
  height: 568px;
}
.screen.iPhone6, .screen.iPhone7 {
  width: 375px;
  height: 667px;
}
.screen.iPhonePlus {
  width: 414px;
  height: 736px;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.nps.screenshot img {
  width: 100%;
  height: auto;
}

.nps.formContainer {
  position: fixed;
  width: 100%;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
}
@media (min-width: 736px) {
  .nps.formContainer {
    width: 414px;
    height: auto;
    top: inherit;
    right: 1rem;
    bottom: 1rem;
    left: inherit;
    border-radius: 0.5rem;
    box-shadow: 0 0.5rem 3rem rgba(0, 0, 0, 0.33);
  }
}
.nps.formContainer.transitionOut {
  display: none;
}
.nps.formContainer.transitionIn {
  display: block;
}

.nps.form {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: white;
  width: 100%;
  min-height: 100%;
  padding-bottom: 1rem;
}

.nps.coverImage {
  width: 100%;
  height: auto;
  padding-bottom: 0.5rem;
  box-sizing: content-box;
}

.nps.h1 {
  font-size: 1.25rem;
  font-weight: bold;
  line-height: 1.2;
  color: #263238;
  padding-top: 1rem;
  padding-right: 1rem;
  padding-bottom: 0.25rem;
  padding-left: 1rem;
}

.nps.h2,
.nps.h3 {
  font-size: 1rem;
  font-weight: normal;
  line-height: 1.2;
  color: #263238;
  padding-top: 0.25rem;
  padding-right: 1rem;
  padding-bottom: 0.5rem;
  padding-left: 1rem;
}

.nps.h3 {
  padding-top: 1rem;
  padding-bottom: 0;
  font-weight: bold;
}

.nps.scaleDescription {
  display: flex;
  justify-content: space-between;
  padding-top: 1rem;
  padding-right: 1rem;
  padding-left: 1rem;
  font-size: 1rem;
  color: #607D8B;
}
.nps.scaleDescription span {
  display: flex;
  align-items: center;
  justify-content: center;
}
.nps.scaleDescription i {
  margin-right: 0.25rem;
}

.nps.scale {
  display: flex;
  height: 2.5rem;
  border-radius: 4px;
  padding: 0.5rem 1rem;
  box-sizing: content-box;
}

.nps.label {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex-grow: 1;
  cursor: pointer;
  color: #40354E;
  border-color: #40354E;
  border-style: solid;
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-right-width: 1px;
  border-left-width: 0;
}
.nps.label[for=one] {
  border-left-width: 1px;
  border-radius: 0.25rem 0 0 0.25rem;
}
.nps.label[for=five] {
  border-radius: 0 0.25rem 0.25rem 0;
}

.nps.input {
  display: none;
}
.nps.input:checked + label {
  background-color: #40354E;
  color: white;
  font-weight: bold;
}

.nps.textarea {
  margin-top: 0.5rem;
  margin-right: 1rem;
  margin-bottom: 0.5rem;
  margin-left: 1rem;
  font-size: 1rem;
  padding: 0.5rem;
  border-radius: 0.25rem;
  font-weight: normal;
  color: #263238;
  border: 1px solid #90A4AE;
}
.nps.textarea::-moz-placeholder {
  color: #607D8B;
}
.nps.textarea:-ms-input-placeholder {
  color: #607D8B;
}
.nps.textarea::placeholder {
  color: #607D8B;
}

.nps.textareaLabel {
  display: flex;
  align-items: center;
  margin-top: 0.5rem;
  margin-right: 1rem;
  margin-bottom: 0.5rem;
  margin-left: 1rem;
  font-size: 0.875rem;
  color: #607D8B;
  cursor: pointer;
}
.nps.textareaLabel input {
  margin-right: 0.25rem;
}

.nps.actions {
  display: flex;
  justify-content: space-between;
  padding-top: 1rem;
}

.nps.close {
  display: flex;
  flex-direction: column;
  text-align: center;
  align-items: center;
  justify-content: center;
  padding: 0 1rem;
  height: 2.5rem;
  font-size: 1rem;
  text-decoration: none;
  font-weight: bold;
  color: #000;
  font-weight: bold;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.nps.button {
  background-color: #000;
  height: 2.5rem;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-weight: normal;
  font-size: 1rem;
  padding: 0 1rem;
  margin-left: 1rem;
  margin-right: 1rem;
  border-radius: 2.5rem;
  box-shadow: none;
  border: none;
  cursor: pointer;
}

.nps.floatingActionButton {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 0;
  cursor: pointer;
  min-width: 2.5rem;
  height: 2.5rem;
  border-radius: 1.5rem;
  background-color: #000;
  color: white;
  font-weight: normal;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: none;
  box-shadow: 0 0.5rem 3rem rgba(0, 0, 0, 0.25);
  font-size: 1rem;
  padding: 0 1rem;
}
.nps.floatingActionButton:focus {
  outline: 0;
}
.nps.floatingActionButton.thankYou {
  background-color: #00c853;
  transform: scale(0);
  -webkit-animation: thankYou ease-in-out 1200ms 150ms forwards;
          animation: thankYou ease-in-out 1200ms 150ms forwards;
}
@-webkit-keyframes thankYou {
  0% {
    transform: scale(0);
  }
  25% {
    transform: scale(1.1);
  }
  50% {
    transform: scale(0.9);
  }
  75% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes thankYou {
  0% {
    transform: scale(0);
  }
  25% {
    transform: scale(1.1);
  }
  50% {
    transform: scale(0.9);
  }
  75% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}
!

JS 

              
                $(window).load( function() {
	$(".nps.floatingActionButton").click( function() {
		$(".nps.formContainer").addClass("transitionIn").removeClass("transitionOut");
		$(this).removeClass("thankYou")
	});
	
	$(".nps.close").click( function() {
		$(".nps.formContainer").addClass("transitionOut").removeClass("transitionIn");
		$(".nps.floatingActionButton").text("🎤 Feedback").removeClass("thankYou");
	});
	
	$(".nps.button").click( function() {
		setTimeout(function(){
			$(".nps.floatingActionButton").fadeOut();	
		}, 3000);
		$(".nps.floatingActionButton").addClass("thankYou").text("Thank you ❤️");
		$(".nps.formContainer").addClass("transitionOut").removeClass("transitionIn");
	});
});
!
999px

Console