<div class="contents">text</div>
<div class="cp_snslink11">
  <div class="cp_link_list">
  <input type="checkbox" id="cp_toggle" />
  <label for="cp_toggle" class="share"></label>
  <ul class="cp_link">
  <li class="twitter"><a href="#" title="Twitter"></a></li>
  <li class="facebook"><a href="#" title="Facebook"></a></li>
  <li class="instagram"><a href="#" title="Instagram"></a></li>
  </ul>
  </div>
</div>

body {
/*設置する親要素ページ全体ならbodyなど*/
  position: relative;
  height: 100vh;
  margin: 0;
  padding: 0;
}
.contents {
/*サンプルはfixedの確認のためにheight指定しています。*/
  height: 2000px;
}
.cp_snslink11 {
  position: fixed;
  bottom: 0;
  right: 20px;
  display: block;
  margin: 0;
}
.cp_snslink11 .cp_link_list{
  position: relative;
  perspective: 1000px;
}
.cp_snslink11 .cp_link_list input{
  display: none;
}
/*シェアボタン*/
.cp_snslink11 .cp_link_list label.share {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50px;
  height: 50px;
  background: #eeeeee;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s;
}
.cp_snslink11 .cp_link_list label.share::before{
  position: absolute;
  content: '';
  background-image: url(share_icon_black.svg);
  background-size: contain;
  background-repeat: no-repeat;
  width: 25px;
  height: 25px;
}
/*各種SNSリンク*/
.cp_snslink11 .cp_link_list .cp_link li {
  position: absolute;
  bottom: 0;/*最初の位置*/
  right: 0;
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  list-style: none;
  margin: 0 0 0 0;
  padding: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.5s;
  z-index: -1;
}
.cp_snslink11 .cp_link_list .cp_link li.twitter {
  background: #000000;
}
.cp_snslink11 .cp_link_list .cp_link li.facebook {
  background: #0866ff;
}
.cp_snslink11 .cp_link_list .cp_link li.instagram {
  background: linear-gradient(45deg, #FF7A00 0%, #FF0169 50.06%, #D300C5 99.36%);
}
/*SNS各種ロゴ*/
.cp_snslink11 .cp_link .facebook::before,
.cp_snslink11 .cp_link .twitter::before,
.cp_snslink11 .cp_link .instagram::before {
  position: absolute;
  content: '';
  background-size: contain;
  background-repeat: no-repeat;
  width: 25px;
  height: 25px;
}
/*facebook*/
.cp_snslink11 .cp_link .facebook::before {
  background-image: url(facebook_logo_secondary.svg);
}
/*twitter*/
.cp_snslink11 .cp_link .twitter::before {
  background-image: url(x-logo.svg);
}
/*instagram*/
.cp_snslink11 .cp_link .instagram::before {
  background-image: url(instagram_glyph_white.svg);
}
/* シェアボタンクリック時の動きの設定 */
.cp_snslink11 .cp_link_list input:checked ~ label {
  transform: scale(0.8, 0.8);
}
.cp_snslink11 .cp_link_list input:checked ~ .cp_link li{
  opacity: 1;
  transform: translateY(0) rotate(360deg);
  transition: all 0.3s;
  opacity: 0.7;
}
.cp_snslink11 .cp_link_list input:checked ~ .cp_link li.twitter{
  bottom: 60px;
  transition-delay: 0;
  z-index: 4;
}
.cp_snslink11 .cp_link_list input:checked ~ .cp_link li.facebook{
  bottom: 120px;
  transition-delay: 0.1s;
  z-index: 3;
}
.cp_snslink11 .cp_link_list input:checked ~ .cp_link li.instagram{
  bottom: 180px;
  transition-delay: 0.2s;
  z-index: 2;
}
.cp_snslink11 .cp_link_list input:checked ~ .cp_link li:hover {
  opacity: 1;
  transform: scale(1.1, 1.1);
}