HTML

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<button class="back-to-top-button">
  <svg class="svg-icon" viewBox="0 0 384 512">
 
 
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CSS

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.back-to-top-button {
  width: 50px;
 
 
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JS

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.back-to-top-button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: rgb(20, 20, 20);
  border: none;
  font-weight: 600;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-shadow: 0px 0px 0px 4px rgba(180, 160, 255, 0.253);
  box-shadow: 0px 0px 0px 4px rgba(180, 160, 255, 0.253);
  cursor: pointer;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  overflow: hidden;
  position: relative;
}

.svg-icon {
  width: 12px;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
}

.svg-icon path {
  fill: white;
}

.back-to-top-button:hover {
  width: 140px;
  border-radius: 50px;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  background-color: rgb(181, 160, 255);
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

.back-to-top-button:hover .svg-icon {
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transform: translateY(-200%);
  -ms-transform: translateY(-200%);
  transform: translateY(-200%);
}

.back-to-top-button::before {
  position: absolute;
  bottom: -20px;
  content: "Back to Top";
  color: white;
  font-size: 0px;
}

.back-to-top-button:hover::before {
  font-size: 13px;
  opacity: 1;
  bottom: unset;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
}

Animated Back to Top Button

Animated back-to-top button with a unique hover effect. When you hover over the button, the button will expand and show “Back to Top” text instead of the up-arrow.