HTMLify

@import "https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap";
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  height: 100vh;
  background-color: #151515;
  display: grid;
  place-items: center;
}
.button-container {
  position: relative;
  height: 80px;
  width: 200px;
  border: 1px solid #fff;
  border-radius: 0.5rem;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}
.button-container button {
  width: 100%;
  height: 100%;
  font-family: "poppins";
  font-weight: 700;
  font-size: 1.25rem;
  mask: url(https://raw.githubusercontent.com/robin-dela/css-mask-animation/master/img/nature-sprite.png);
  mask-size: 2300% 100%;
  -webkit-mask: url(https://raw.githubusercontent.com/robin-dela/css-mask-animation/master/img/nature-sprite.png);
  -webkit-mask-size: 2300% 100%;
  border: none;
  cursor: pointer;
  animation: anim2 0.7s steps(22) forwards;
}
.button-container button:hover {
  animation: anim1 0.7s steps(22) forwards;
  color: #000;
}
.mask {
  position: absolute;
  color: #fff;
  display: grid;
  place-items: center;
  font-family: "poppins";
  font-weight: 700;
  font-size: 2rem;
  width: 100%;
}
@keyframes anim1 {
  from {
    -webkit-mask-position: 100% 0;
    mask-position: 100% 0;
  }
  to {
    -webkit-mask-position: 0 0;
    mask-position: 0 0;
  }
}
@keyframes anim2 {
  from {
    -webkit-mask-position: 0 0;
    mask-position: 0 0;
  }
  to {
    -webkit-mask-position: 100% 0;
    mask-position: 100% 0;
  }
}