<button class="button01"><span>more</span></button>

<button class="button02"><span>more</span></button>

<button class="button03"><span>more</span></button>
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: #fff;
}
button {
  position: relative;
  min-width: 240px;
  margin: 0 2em;
  background: none;
  border: none;
  color: #fff;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: .3em;
  text-align: center;
  cursor: pointer;
  span {
    position: relative;
    z-index: 2;
    display: block;
    padding: 1.25em .5em 1.35em .5em;
  }
}

.button01 {
  span {
    background: linear-gradient(135deg, #feac5e, #c779d0, #4bc0c8);
    transition: .3s;
    &::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: -10%;
      width: 95%;
      height: 30%;
      background: inherit;
      transform: translateX(-50%);
      filter: blur(10px);
      opacity: 0;
      transition: .3s;
    }
  }
  &:hover {
    span {
      transform: translateY(-6px);
      &::after {
        opacity: 1;
      }
    }
  }
}

.button02 {
  background: linear-gradient(135deg, #feac5e, #c779d0, #4bc0c8);
  background-size: 300% auto;
  transition: .5s;
  &:hover {
    background-position: 100% 0;
  }
}

.button03 {
  overflow: hidden;
  &::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 110%;
    height: 400%;
    background: linear-gradient(135deg, #feac5e 20%, #c779d0 50%, #4bc0c8 80%);
    transform: translate3d(-50%, -50%, 0);
    transition: .5s;
  }
  &:hover::before {
    transform: translate3d(-50%, -50%, 0) rotate(-180deg);
  }
}
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