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CSS

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HTML 

              
                <div class="container" id="container">
  <div class="row">
    <h1><span>clip-path</span> Buttons</h1>
  </div>

  <div class="row">
    <h2>Normal</h2>
  </div>

  <div class="row">
    <div class="box">
      <p>Top to bottom</p>
      <button href="#" class="top-to-bottom">Click on me!</button>
    </div>

    <div class="box">
      <p>Left to right</p>
      <button href="#" class="left-to-right">Click on me!</button>
    </div>

    <div class="box">
      <p>Center out y</p>
      <button href="#" class="center-out-y">Click on me!</button>
    </div>

    <div class="box">
      <p>Center out x</p>
      <button href="#" class="center-out-x">Click on me!</button>
    </div>
  </div>

  <div class="row">
    <h2>Dramatic</h2>
  </div>

  <div class="row">
    <div class="box">
      <p>Top to bottom</p>
      <button href="#" class="top-to-bottom dramatic">Click on me!</button>
    </div>

    <div class="box">
      <p>Left to right</p>
      <button href="#" class="left-to-right dramatic">Click on me!</button>
    </div>

    <div class="box">
      <p>Center out y</p>
      <button href="#" class="center-out-y dramatic">Click on me!</button>
    </div>

    <div class="box">
      <p>Center out x</p>
      <button href="#" class="center-out-x dramatic">Click on me!</button>
    </div>
  </div>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=PT+Mono&family=Poppins:wght@400;600&display=swap");

body {
  background-color: #20232e;
  color: #a1b1e6;
  font-family: "Poppins", sans-serif;
  font-weight: 400;
}

h1,
h2 {
  font-weight: 600;

  span {
    color: #fcba03;
    font-family: "PT Mono", monospace;
  }
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
}

.row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.box {
  background-color: #2e3342;
  border: 1px solid #444b61;
  border-radius: 6px;
  margin: 10px;
  padding: 10px 30px;
}

button {
  align-items: center;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  font-family: "Poppins", sans-serif;
  font-size: 18px;
  height: 44px;
  margin: 15px 0;
  padding: 0 25px;
  position: relative;
  text-decoration: none;
  z-index: 1;

  &:before,
  &:after {
    border-radius: 50px;
    content: "";
    display: block;
    left: 0;
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    transition: clip-path 275ms ease-in-out;
  }

  &.dramatic:before,
  &.dramatic:after {
    transition: none;
  }

  &:before {
    background: rgb(51, 56, 59);
    background: linear-gradient(
      60deg,
      rgba(58, 62, 82, 1) 0%,
      rgba(96, 103, 136, 1) 100%
    );
    box-shadow: -1px 1px 1px 0px rgba(128, 141, 203, 1) inset,
      0px 0px 0px 4px rgba(14, 16, 20, 0.7);
  }

  &:after {
    background: rgb(165, 58, 180);
    background: linear-gradient(
      90deg,
      rgba(165, 58, 180, 1) 0%,
      rgba(244, 87, 87, 1) 100%
    );
    box-shadow: -1px 1px 1px 0px rgba(247, 147, 147, 1) inset,
      0px 0px 0px 4px rgba(14, 16, 20, 0.7);
  }

  &.left-to-right:after {
    clip-path: inset(0 100% 0 0);
  }

  &.left-to-right:focus:after {
    clip-path: inset(0 0 0 0);
  }

  &.center-out-y:after {
    clip-path: inset(50% 0 50% 0);
  }

  &.center-out-y:focus:after {
    clip-path: inset(0 0 0 0);
  }

  &.center-out-x:after {
    clip-path: inset(0 50% 0 50%);
  }

  &.center-out-x:focus:after {
    clip-path: inset(0 0 0 0);
  }

  &.top-to-bottom:after {
    clip-path: inset(0 0 100% 0);
  }

  &.top-to-bottom:focus:after {
    clip-path: inset(0 0 0 0);
  }

  &.top-to-bottom.dramatic:focus:after {
    animation-name: topToBottom;
    animation-duration: 750ms;
    animation-fill-mode: forwards;
  }

  &.left-to-right.dramatic:focus:after {
    animation-name: leftToRight;
    animation-duration: 750ms;
    animation-fill-mode: forwards;
  }

  &.center-out-y.dramatic:focus:after {
    animation-name: centerOutY;
    animation-duration: 1000ms;
    animation-fill-mode: forwards;
  }

  &.center-out-x.dramatic:focus:after {
    animation-name: centerOutX;
    animation-duration: 1000ms;
    animation-fill-mode: forwards;
  }
}

@keyframes topToBottom {
  0% {
    clip-path: inset(0 0 100% 0);
  }

  20% {
    clip-path: inset(0 0 0 0);
  }

  50% {
    clip-path: inset(0 0 50% 0);
  }

  60% {
    clip-path: inset(0 0 0 0);
  }

  75% {
    clip-path: inset(0 0 30% 0);
  }

  85% {
    clip-path: inset(0 0 0 0);
  }

  90% {
    clip-path: inset(0 0 20% 0);
  }

  94% {
    clip-path: inset(0 0 0 0);
  }

  96% {
    clip-path: inset(0 0 10% 0);
  }

  98% {
    clip-path: inset(0 0 0 0);
  }

  99% {
    clip-path: inset(0 0 3% 0);
  }

  100% {
    clip-path: inset(0 0 0 0);
  }
}

@keyframes leftToRight {
  0% {
    clip-path: inset(0 100% 0 0);
  }

  20% {
    clip-path: inset(0 0 0 0);
  }

  50% {
    clip-path: inset(0 50% 0 0);
  }

  60% {
    clip-path: inset(0 0 0 0);
  }

  75% {
    clip-path: inset(0 30% 0 0);
  }

  85% {
    clip-path: inset(0 0 0 0);
  }

  90% {
    clip-path: inset(0 20% 0 0);
  }

  94% {
    clip-path: inset(0 0 0 0);
  }

  96% {
    clip-path: inset(0 10% 0 0);
  }

  98% {
    clip-path: inset(0 0 0 0);
  }

  99% {
    clip-path: inset(0 3% 0 0);
  }

  100% {
    clip-path: inset(0 0 0 0);
  }
}

@keyframes centerOutY {
  0% {
    clip-path: inset(50% 0 50% 0);
  }

  20% {
    clip-path: inset(0 0 0 0);
  }

  50% {
    clip-path: inset(25% 0 25% 0);
  }

  60% {
    clip-path: inset(0 0 0 0);
  }

  75% {
    clip-path: inset(12.5% 0 12.5% 0);
  }

  85% {
    clip-path: inset(0 0 0 0);
  }

  90% {
    clip-path: inset(6% 0 6% 0);
  }

  94% {
    clip-path: inset(0 0 0 0);
  }

  96% {
    clip-path: inset(3% 0 3% 0);
  }

  98% {
    clip-path: inset(0 0 0 0);
  }

  99% {
    clip-path: inset(1.5% 0 1.5% 0);
  }

  100% {
    clip-path: inset(0 0 0 0);
  }
}

@keyframes centerOutX {
  0% {
    clip-path: inset(0 50% 0 50%);
  }

  20% {
    clip-path: inset(0 0 0 0);
  }

  50% {
    clip-path: inset(0 25% 0 25%);
  }

  60% {
    clip-path: inset(0 0 0 0);
  }

  75% {
    clip-path: inset(0 12.5% 0 12.5%);
  }

  85% {
    clip-path: inset(0 0 0 0);
  }

  90% {
    clip-path: inset(0 6% 0 6%);
  }

  94% {
    clip-path: inset(0 0 0 0);
  }

  96% {
    clip-path: inset(0 3% 0 3%);
  }

  98% {
    clip-path: inset(0 0 0 0);
  }

  99% {
    clip-path: inset(0 1.5% 0 1.5%);
  }

  100% {
    clip-path: inset(0 0 0 0);
  }
}
!

JS 

              
                const container = document.getElementById("container");
container.addEventListener("click", (event) => {
  const isButton = event.target.nodeName === "BUTTON";
  if (!isButton) {
    return;
  }
  event.target.focus();
});
!
999px

Console