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                <div class="ch-button">
  <a href="#">
    <p class="before-text">押して!</p>
    <p class="after-text">PUSH!</p>


                /*** ボタン全体 ***/{
  position: relative; /*子要素の基準位置*/
  width: 20rem;
  height: 3rem;
  border: 2px solid red;

/*** ボタン内の文言共通 ***/
.ch-button p{
  display: flex;
  align-items: center;
  justify-content: space-around;
  transition: .3s;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: initial;

/*** 1つ目の文言は色付きの文字 ***/
  color: red; /*文字色*/
/*** 2つ目の文言は背景付の白文字 ***/
.ch-button .after-text{
  background: red; /*背景色*/
  visibility: hidden; /*非表示*/
  opacity: 0; /*透明*/

/*** ホバー時に文言を入れ替え ***/
.ch-button:hover .before-text{
  visibility:hidden; /*非表示*/
  opacity: 0; /*透明*/
.ch-button:hover .after-text{
  visibility: visible; /*表示*/
  opacity: 1; /*不透明*/

/*** 装飾用 ***/
  border-radius: 6px;
  margin: 1em auto;
.ch-button a{
  text-decoration: none;
  color: #fff;