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<input type="checkbox" id="close"><!--チェックボックス-->  
<div class="float-btn"> <!--追従ボタン-->
  <a href="#">ここにボタン</a>
  <label for="close" class="fb-close">×</label> <!-- 閉じるボタン -->


                /*** 追従パーツの全体 ***/
  position: fixed; /*画面固定*/
  bottom: 0; /*下*/
  left: 0;
  width: 100%; /*フルワイド*/
  background: rgba(0,0,0,50%); /*半透明の黒*/
  padding: 16px 0;
  display: flex; /*中身をフレックス表示*/
  justify-content: center; /*中央寄せ*/
  align-items: center; /*縦軸中央寄せ*/

  animation: slideIn .4s forwards; /*アニメ付与*/
  animation-delay: 6s; /*アニメーション開始までの遅延時間*/
  transform: translateY(100%); /*開始まで隠す*/

@keyframes slideIn{
  0%{ transform: translateY(100%);} /*画面外*/
  100%{ transform: translateY(0);} /*画面内*/

/*** マイクロコピー ***/
.float-btn > p{
  color: #fff;
  margin: 0 1rem;
/* スマホ向け */
@media screen and (max-width: 520px){
  .float-btn p{
    display: none; /*非表示*/

/*** ボタン部分 ***/
.float-btn > a{
  display: inline-block;
  vertical-align: middle; /*上下中央寄せ*/
  line-height: 1.5;
  padding: 5px 30px;
  border-radius: 4px;
  background: #F37167;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 2px 0 #96150C;
  transition: .3s;
.float-btn a:hover{
  transform: translateY(2px); /*押下*/
  box-shadow: none;

/*** 閉じるボタン ***/
  position: absolute;
  top: 0;
  right: 20px;
  color: #fff;
  font-size: 18px;
  cursor: pointer;

/*** ×をクリック(チェックボックスに✔) ***/
#close:checked ~ .float-btn{
  display: none; /*バナー削除*/

/*** チェックボックスは非表示に ***/
  display: none;

/*** サンプル装飾用 ***/
  padding-bottom: 400vh;
  zoom: 0.9;
body > p{
  text-align: center;
  font-size: 26px;