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HTML 

              
                <div class="container">

	<div class="button">
		<div class="base"></div>
		<input type="checkbox" id="push">
		<label for="push"></label>
		<div class="btn"></div>
	</div>
	
</div>
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CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Londrina+Solid&display=swap');
 
* {
  box-sizing: border-box;	
  transform-style: preserve-3d;
}

body {
  margin: 0;
  padding: 0;
  background: linear-gradient(90deg, #101010, #444);
  height: 100vh;
  overflow: hidden;
}

.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.button {
  width: 90vmin;
  height: 44vmin;
  perspective: 100vmin;
}

.base {
  background: linear-gradient(90deg, #888 10%, #999 80%, #fff 90%, #ccc 100%);
  width: 100%;
  height: 36vmin;
  bottom: 0;
  position: absolute;
  border-radius: 14vmin;
  border-bottom: 0.25vmin solid #303030;
  box-shadow: 2vmin 0 2vmin 0 #0008 inset, -0.25vmin 0.25vmin 0.5vmin 0.25vmin #000c, 0vmin 1vmin 1vmin 0 #fff4;
}

.base:before {
  content: "";
  width: 100%;
  height: 85%;
  background: linear-gradient(90deg, #999 10%, #ccc 80%, #fff 90%, #eee 100%);
  position: absolute;
  border-radius: 14vmin;
  top: 0vmin;
  z-index: -1;
  border: 0.25vmin solid #adadad;
  box-sizing: border-box;
}

.btn {
  width: 90%;
  height: 32vmin;
  background: linear-gradient(86deg, #564672 10%, #7b64a3 60%, #b696ed 88%, #9e78df 100%);
  border-radius: 12vmin;
  left: 5%;
  position: absolute;
  bottom: 10vmin;
  box-shadow: 2vmin 0 2vmin 0 #0008 inset;
  border-bottom: 0.25vmin solid #0008;
  transition: all 0.25s ease 0s;
}

.btn:before {
  content: "";
  width: 100%;
  height: 25vmin;
  background: linear-gradient(84deg, #7c65a5 10%, #9c7fcf 60%, #d1b6ff 87%, #ba92ff 100%);
  position: absolute;
  border-radius: 14vmin;
  top: -2vmin;
  z-index: -1;
  border: 0.15vmin solid #3333338a;
  box-sizing: border-box;
  border-bottom-width: 0.25vmin;
}

.btn:after {
  text-align: center;
  content: "MEGA BUTTON";
  width: 100%;
  height: 25vmin;
  position: absolute;
  border-radius: 14vmin;
  top: -2vmin;
  z-index: -1;
  box-sizing: border-box;
  border-bottom-width: 0.25vmin;
  font-family: 'Londrina Solid', Arial, Helvetica, serif;
  font-size: 11vmin;
  line-height: 22vmin;
  transform: rotateX(10deg);
  transform-origin: center top;
  color: #d6bfff;
  font-weight: bold;
  letter-spacing: 0.5vmin;
  text-shadow: 0px 1px 0px #999, 0px 2px 0px #888, 0px 3px 0px #777, 0px 4px 0px #666, 0px 5px 0px #555, 0px 6px 0px #444, 0px 7px 0px #333, 0px 8px 7px #001135;
}





input { display: none; }

label {
  width: 90%;
  height: 34vmin;
  position: absolute;
  border-radius: 12vmin;
  top: 0;
  left: 5%;
  z-index: 2;
  cursor: pointer;
  transform-origin: center top;
  transform: rotateX(10deg);
}

input:checked + label {
  height: 30vmin;
  top: 4vmin;
  transform: rotateX(13deg);
}

input:checked ~ .btn {
  height: 28vmin;
  transition: all 0.25s ease 0s;
  text: shadow: 2vmin 0 2vmin 0 #0008 inset, 0 1vmin 10vmin 1vmin #7d34ff;
}

label:active ~ .btn {
  height: 26vmin;
  transition: all 0.25s ease 0s;
}

input:checked ~ .btn:after {
  color: #ede2ff;
  transform: rotateX(13deg);
  text-shadow: 0 0 5vmin #6321f1, 0 0 5vmin #fff8, 0px 1px 0px #c2b8d3, 0px 2px 0px #a99dbf, 0px 3px 0px #9281b1, 0px 4px 0px #7c7091, 0px 5px 0px #554c66, 0px 6px 0px #4d4162, 0px 7px 0px #1f0b42, 0px 8px 7px #15013a;
}

input:checked ~ .btn:before {
  box-shadow: 0 0 2vmin #0000004a, 0 0 10vmin 5vmin #b68dff, 0 0 10vmin 5vmin #d8c3ff inset;
}
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