index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.11.2/css/all.css">
  </head>
  <body>
    <div class="share-button">
      <span><i class="fas fa-share-alt"></i> Share!</span>
      <a href="#"><i class="fab fa-facebook-f"></i></a>
      <a href="#"><i class="fab fa-twitter"></i></a>
      <a href="#"><i class="fab fa-instagram"></i></a>
      <a href="#"><i class="fab fa-linkedin-in"></i></a>
    </div>
  </body>
</html>

style.css

body{
  margin: 0;
  padding: 0;
  font-family: "montserrat",sans-serif;
  background: #f1f1f1;
  display: flex;
  height: 100vh;
  align-items: center;
  justify-content: center;
}

.share-button{
  width: 280px;
  height: 80px;
  background: #dfe6e9;
  border-radius: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  cursor: pointer;
  transition: .3s linear;
}

.share-button:hover{
  transform: scale(1.1);
}

.share-button span{
  position: absolute;
  width: 100%;
  height: 100%;
  background: #2d3436;
  color: #f1f1f1;
  text-align: center;
  line-height: 80px;
  z-index: 999;
  transition: .6s linear;
  border-radius: 40px;
}

.share-button:hover span{
  transform: translateX(-100%);
  transition-delay: .3s;
}

.share-button a{
  flex: 1;
  font-size: 26px;
  color: #2d3436;
  text-align: center;
  transform: translateX(-100%);
  opacity: 0;
  transition: 0.3s linear;
}

.share-button:hover a{
  opacity: 1;
  transform: translateX(0);
}

.share-button a:nth-of-type(1){
  transition-delay: 1s;
}

.share-button a:nth-of-type(2){
  transition-delay: 0.8s;
}

.share-button a:nth-of-type(3){
  transition-delay: 0.6s;
}

.share-button a:nth-of-type(4){
  transition-delay: 0.4s;
}

让链接同时具备两种打开方式