HTML CSS 

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@import "https://use.fontawesome.com/releases/v5.15.4/css/all.css";

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

html {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  font-size: 62.5%;
}

.btn,
a.btn,
button.btn {
	font-size: 1.6rem;
	font-weight: 700;
	line-height: 1.5;
	position: relative;
	display: inline-block;
	padding: 1rem 4rem;
	cursor: pointer;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	-webkit-transition: all 0.3s;
	transition: all 0.3s;
	text-align: center;
	vertical-align: middle;
	text-decoration: none;
	letter-spacing: 0.1em;
	color: #FFF;
	border-radius: 0.5rem;
	font-family: 'Noto Sans JP', sans-serif;
	font-family: 'Quicksand', sans-serif;
	font-family: 'Shippori Mincho', serif;
	font-family: 'Zen Kaku Gothic New', sans-serif;
}

a.btn-custom01 {
  margin-bottom: 0.5rem;
  padding: 0;
  border-radius: 0.75rem;
}

a.btn-custom01:before {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;

  width: 100%;
  height: 100%;

  content: "";
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  -webkit-transform: translate3d(0, 0.75rem, -1rem);
  transform: translate3d(0, 0.75rem, -1rem);

  border: 1px solid #666;
  border-radius: inherit;
  background: rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 0.6rem 0 0 rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.6rem 0 0 rgba(0, 0, 0, 0.2);
}

a.btn-custom01:after {
  font-family: "Font Awesome 5 Free";
  font-size: 2rem;
  font-weight: normal;
  line-height: 1;
  position: absolute;
  top: calc(50% - 1rem);
  left: 1.5rem;
  margin: 0;
  padding: 0;
  content: "\f0e0";
}

.btn-custom01-front {
  position: relative;
  display: block;
  padding: 1.5rem 5rem 1.5rem 5rem;

  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: 2px solid #FFF;
  border-radius: inherit;
  background: rgba(10, 10, 0, 0.2);
}

.fa-position-left {
  position: absolute;
  top: calc(50% - 0.5em);
  left: 1rem;
}

.fa-position-right {
  position: absolute;
  top: calc(50% - 0.5em);
  right: 1rem;
}

a.btn-custom01:hover {
  -webkit-transform: translate(0, 0.25rem);
  transform: translate(0, 0.25rem);
  background: rgba(0, 0, 0, 0.2);
}

a.btn-custom01:hover:before {
  -webkit-transform: translate3d(0, 0.5rem, -1rem);
  transform: translate3d(0, 0.5rem, -1rem);
  -webkit-box-shadow: 0 0.35rem 0 0 rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.35rem 0 0 rgba(0, 0, 0, 0.2);
}

a.btn-custom01:hover:after {
  content: "\f2b6";
}

a.btn-custom01:active {
  -webkit-transform: translate(0rem, 0.75rem);
  transform: translate(0rem, 0.75rem);
}

a.btn-custom01:active:before {
  -webkit-transform: translate3d(0, 0, -1rem);
  transform: translate3d(0, 0, -1rem);
  -webkit-box-shadow: 0 0.35rem 0 0 rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.35rem 0 0 rgba(0, 0, 0, 0.2);
}

a.btn-custom01:active:after {
  content: "\f2b6";
}