<ul>
	<li><a href="#" class="btn gradient1">button</a></li>
	<li><a href="#" class="btn gradient2">button</a></li>
	<li><a href="#" class="btn gradient3">button</a></li>
</ul>
body {
	min-height: 100vh;
	margin: 0;
	padding: 0;
	display: flex;
	justify-content: center;
	align-items: center;
}
ul {
	flex-basis: 80%;
	padding: 0;
	margin: 0;
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
}
ul li {
	flex-basis: 32%;
	list-style-type: none;
}
a {
  text-decoration: none;
}


.btn {
	font-size: 18px;
  color: #fff;
  padding: 20px 50px;
  display: block;
  border-radius: 50px;
	text-align: center;
  position: relative;
  z-index: 2;
  will-change: transform, filter;
  transform-style: preserve-3d;
  transition: all .3s ease-out;
}
.btn:hover {
  transform: scale(0.95);
}
.btn::before {
  content: "";
  height: 40px;
  display: inline-block;
  position: absolute;
  left: 30px;
  right: 30px;
  bottom: -5px;
  z-index: -1;
  border-radius: 50px;
	opacity: .8;
  filter: blur(15px);
  transform-style: preserve-3d;
  transition: all .3s ease-out;
}
.btn:hover::before {
  bottom: 0;
  filter: blur(8px);
}
.gradient1,
.gradient1::before {
  background: -moz-linear-gradient(left, #0396FF 0%, #ABDCFF 80%, #ABDCFF 100%);
  background: -webkit-linear-gradient(left, #0396FF 0%, #ABDCFF 80%, #ABDCFF 100%);
  background: linear-gradient(to right, #0396FF 0%, #ABDCFF 80%, #ABDCFF 100%);
}
.gradient2,
.gradient2::before {
  background: -moz-linear-gradient(left, #E96D71 0%, #FAD7A1 80%, #FAD7A1 100%);
  background: -webkit-linear-gradient(left, #E96D71 0%, #FAD7A1 80%, #FAD7A1 100%);
  background: linear-gradient(to right, #E96D71 0%, #FAD7A1 80%, #FAD7A1 100%);
}
.gradient3,
.gradient3::before {
  background: -moz-linear-gradient(left, #32CCBC 0%, #90F7EC 80%, #90F7EC 100%);
  background: -webkit-linear-gradient(left, #32CCBC 0%, #90F7EC 80%, #90F7EC 100%);
  background: linear-gradient(to right, #32CCBC 0%, #90F7EC 80%, #90F7EC 100%);
}
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