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                <div class="ch-button">
  <a href="#">
    <p class="before-text">わたがし抱き枕を購入</p>
    <p class="after-text">最高の抱き心地をあなたに</p>


                /*** ボタン全体 ***/{
  position: relative; /*子要素の基準位置*/
  width: 20rem;
  height: 3rem;
  overflow: hidden; /*ボタン外の要素を非表示に*/

/*** ボタン内の文言共通 ***/
.ch-button p{
  display: flex;
  align-items: center;
  justify-content: space-around;
  transition: .4s;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: initial;

/*** 2つ目の文言は標準時隠しておく ***/
  transform: translateX(-110%); /*左側に隠しておく*/

/*** ホバー時に文言を入れ替え ***/
  transform: translateX(110%); /*ボタンの右に出ていく*/
.ch-button:hover .after-text{
  transform: translateX(0); /*ボタンの中へ*/

/*** 装飾用 ***/
  box-shadow: 0 0 4px rgb(0 0 0 /60%);
  border-radius: 6px;
  background: #3EACA8;
  margin: 1em auto;
.ch-button a{
  text-decoration: none;
  color: #fff;