<section>
  <button class="button1" data-text="Action"><span>ぽっ</span></button>
  <button class="button2">ぽわ</button>
  <button class="button3"><span>じんわり</span></button>
  
</section>
* {
  font-family: "Hiragino Kaku Gothic ProN", "ヒラギノ角ゴ ProN W3", Meiryo;
  text-decoration: none;
  outline: none;
}

$font1: #fff;
$color1: #c06666;
$color2: #8965a3;
$color3: #7545c0;
$base: #f08080;

[class^="button"] {
  &:hover {
    cursor: pointer;
  }
}



.button1 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 0;
  background-color: $color1;
  border: none;
  border-radius: 3px;
  position: relative;
  transition: all .25s linear;
  &:hover {
    letter-spacing: 3px;
    box-shadow: 0 0 10px rgba($color1, .9),0 0 10px rgba($color1, .9);
  }
  span {
    position: absolute;
    display: inline-block;
    width: 100%;
    top: 50%;
    left: 0;
    text-align: center;
    transform: translateY(-50%);
  }
  &:after {
    content: attr(data-text);
    opacity: 0;
    letter-spacing: 2px;
    display: block;
    padding: 15px 20px;
  }
}

.button2 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 10px;
  background-color: $color1;
  border: none;
  border-radius: 40px;
  width: 80px;
  height: 80px;
  position: relative;
  &:before, &:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 80px;
    height: 80px;
    border: 1px solid $color1;
    border-radius: 40px;
    box-sizing: border-box;
  }
  &:hover {
    &:before {
      animation: spread 1.0s 1 linear;
    }
    &:after {
      animation: spread 1.0s  0.25s 1 linear;
    }
  }
}

.button3 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 15px 20px;
  background: linear-gradient(65deg, $color3 0%, $color2 30%, $color1 80%, $color1 200%);
  background-size: 330%;
  background-position: 97%;
  border: none;
  border-radius: 3px;
  transition: all .6s linear;
  span {
    position: relative;
    z-index: 100;
  }
  &:hover {
    background-position: 2%;
  }
}



html,body {
  margin: 0;
  width: 100vw;
  min-width: 580px;
  height: 100vh;
  position: relative;
  background-color: $base;
}
section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 580px;
  transform: translate(-50%, -50%);
}

@keyframes spread {
  0%{
    transform: scale(1);
  }
  90% {
    opacity: 0;
  }
  100%{
    transform:scale(2.0);
    opacity: 0;
  }
}
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