Efeito de animação de hover em HTML, CSS e Javascript

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Efeito de animação de hover em HTML, CSS e Javascript

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CSS

*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
body {
  background: #111;
  display:flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.button-wrap{
  margin:10px auto;
  text-align: center;
} 
.hover-button{
  position:relative;
  box-sizing: border-box;
  background:rgba(255,255,255,0);
  border:none;
  font-size: 1.5rem;
  color:turquoise;
  transition: all 0.2s ease;
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  overflow:hidden;
  border-radius: 50%;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  width:200px;
  height:200px;
} 
.hover-button:before{
  --size:0;
  content:'';
  position:absolute;
  left:var(--x);
  top:var(--y);
  width:var(--size);
  height:var(--size);
  background:radial-gradient(circle closest-side, turquoise, transparent);
  transform:translate(-50%, -50%);
  -webkit-transform:translate(-50%, -50%);
  -moz-transform:translate(-50%, -50%);
  -ms-transform:translate(-50%, -50%);
  -o-transform:translate(-50%, -50%);
  transition:width 0.2s ease, height 0.2s ease;
  -webkit-transition:width 0.2s ease, height 0.2s ease;
  -moz-transition:width 0.2s ease, height 0.2s ease;
  -ms-transition:width 0.2s ease, height 0.2s ease;
  -o-transition:width 0.2s ease, height 0.2s ease;
}
.hover-button:hover:before{
  --size:200px;
}
.hover-button:hover{
  color:#111;
  cursor: none;
}
.hover-button span{
  position:relative;
  font-weight:bold;
}

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