<div class="simpleButton">
  <a href="#">詳細はこちら</a>
</div>
                

.simpleButton a {
  color: #000;
  display: inline-block;
  line-height: 1.4em;
  padding: 0.6em 3em 0.6em 2.2em;
  border-radius: 2.8em;
  border: #fff solid 0.2em;
  position: relative;
  background: #ccc;
  box-shadow: 0 0.3em 0 0 rgba(0, 0, 0, 1);
  transition: 0.3s all ease;
}
.simpleButton a::after {
  content: "";
  width: 1em;
  height: 1em;
  display: block;
  background: url("/img/icon/long-arrow-right.svg") no-repeat center center;
  background-size: 100% auto;
  position: absolute;
  top: 50%;
  right: 1.4em;
  margin-top: -0.5em;
  transition: 0.3s all ease;
}
.simpleButton a:hover {
  color: #000;
  box-shadow: 0 0 0 0 rgba(0, 0, 0, 1);
  transform: translateY(0.3em);
}
.simpleButton a:hover:active {
  box-shadow: 0 -0.3em 0 0 rgba(0, 0, 0, 0.3);
  transform: translateY(0.5em);
}
              

.simpleButton a {
  color: #000;
  display: inline-block;
  line-height: 1.4em;
  padding: 0.6em 3em 0.6em 2.2em;
  border-radius: 2.8em;
  border: #fff solid 0.2em;
  position: relative;
  background: #ccc;
  box-shadow: 0 0.3em 0 0 rgba(0, 0, 0, 1);
  transition: 0.3s all ease;
  &::after {
    content: "";
    width: 1em;
    height: 1em;
    display: block;
    background: url("/img/icon/long-arrow-right.svg") no-repeat center center;
    background-size: 100% auto;
    position: absolute;
    top: 50%;
    right: 1.4em;
    margin-top: -0.5em;
    transition: 0.3s all ease;
  }
  &:hover{
    color: #000;
    box-shadow: 0 0 0 0 rgba(0, 0, 0, 1);
    transform: translateY(0.3em);
    &:active {
      box-shadow: 0 -0.3em 0 0 rgba(0, 0, 0, 0.3);
      transform: translateY(0.5em);
    }
  }
}