<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: 0.5em 3em 0.5em 2.2em;
  background: transparent;
  border-radius: 1.46em;
  vertical-align: bottom;
  position: relative;
  background-color: #ccc;
  background-image: linear-gradient(0deg, #e0e0e0, #fafafa);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 1px 4px rgba(0, 0, 0, 0.2),
    0 2px 7px rgba(0, 0, 0, 0.3);
  transition: 0.3s all ease;
}
.simpleButton a::after {
  content: "";
  width: 0.8em;
  height: 0.8em;
  display: block;
  background: url("/img/icon/arrow-circle-o-right.svg") no-repeat center center;
  background-size: 100% auto;
  position: absolute;
  top: 50%;
  right: 1.4em;
  margin-top: -0.4em;
  transition: 0.3s all ease;
}
.simpleButton a:hover {
  color: #000;
  background-color: #ccc;
  background-image: linear-gradient(0deg, #eee, #ddd);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1), 0 1px 4px rgba(0, 0, 0, 0.1),
    0 2px 7px rgba(0, 0, 0, 0.1);
}
.simpleButton a:hover::after {
  right: 1em;
}
              

.simpleButton {
 a {
    color: #000;
    display: inline-block;
    line-height: 1.4em;
    padding: 0.5em 3em 0.5em 2.2em;
    background: transparent;
    border-radius: 1.46em;
    vertical-align: bottom;
    position: relative;
    background-color: #ccc;
    background-image: linear-gradient(0deg, #e0e0e0, #fafafa);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 1px 4px rgba(0, 0, 0, 0.2),
      0 2px 7px rgba(0, 0, 0, 0.3);
    transition: 0.3s all ease;
  }
  &::after {
    content: "";
    width: 0.8em;
    height: 0.8em;
    display: block;
    background: url("/img/icon/arrow-circle-o-right.svg") no-repeat center center;
    background-size: 100% auto;
    position: absolute;
    top: 50%;
    right: 1.4em;
    margin-top: -0.4em;
    transition: 0.3s all ease;
  }
  &:hover {
    color: #000;
    background-color: #ccc;
    background-image: linear-gradient(0deg, #eee, #ddd);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1), 0 1px 4px rgba(0, 0, 0, 0.1),
      0 2px 7px rgba(0, 0, 0, 0.1);
    &::after {
      right: 1em;
    }
  }
}