<section>
  <button class="button1">ピッ</button>
  <button class="button2"><span>キラン</span></button>
  <button class="button3"><span>シュパッ</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: #5b7e99;
$base: #729dbf;

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

.button1 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 15px 40px;
  background-color: $color1;
  border: none;
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  &:before {
    content: " \00BB";
    color: rgba($font1, 0);
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    transition: all .1s linear;
  }
  &:hover:before {
    right: 8px;
    color: rgba($font1, 1);
  }
}

.button2 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 15px 20px;
  background-color: $color1;
  border: none;
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  span {
    position: relative;
    z-index: 100;
  }
  &:after {
    content: "";
    background: #fff;
    width: 50px;
    height: 100px;
    top: -25px;
    left: -75px;
    opacity: .2;
    position: absolute;
    transform: rotate(30deg);
    transition: none;
    z-index: 50;
  }
  &:hover:after {
    left: calc(100% + 25px);
    transition: all .2s linear;
  }
}

.button3 {
  font-size: 21px;
  color: $font1;
  line-height: 1;
  padding: 15px 20px;
  border: 1px solid $font1;
  border-radius: 3px;
  background-color: transparent;
  position: relative;
  overflow: hidden;
  transition: all .1s linear;
  span {
    position: relative;
    z-index: 100;
  }
  &:before {
    content: "";
    display: block;
    width: 0;
    height: 60px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: $color1;
    z-index: 50;
    transition: all .1s linear;
  }
  &:hover {
    color: $font1;
    border-color: $color1;
    &:before {
      width: 110%;
    }
  }
}


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%);
}
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