JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" id="button4" class="buttonText">Подписаться</a>

CSS

#button4 {
  background: #5c5c5c;
  color: white;
  text-shadow: 0px 2px 0px rgba(0, 0, 0, 0.3);
  font-size: 22px;
  height: 58px;
  width: 155px;
  margin: 50px 0 0 50px;
  overflow: hidden;
  display: block;
  text-align: center;
  line-height: 58px;
  
  /*Скругленные углы*/
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
  
  /*Тень*/
  -webkit-box-shadow: 0px 6px 0px rgba(0, 0, 0, 0.8);
  -moz-box-shadow: 0px 6px 0px rgba(0, 0, 0, 0.8);
  box-shadow: 0px 6px 0px rgba(0, 0, 0, 0.8);
  
  /*Градиент*/
  background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
  background-image: -moz-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
  background-image: -o-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
  background-image: -ms-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
  background-image: linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));
}

#button4:hover {
  margin-top: 52px;
  
  /*Тень*/
  -webkit-box-shadow: 0px 4px 0px rgba(0, 0, 0, 0.8);
  -moz-box-shadow: 0px 4px 0px rgba(0, 0, 0, 0.8);
  box-shadow: 0px 4px 0px rgba(0, 0, 0, 0.8);
  
  /*Градиент*/
  background-image: -webkit-linear-gradient(bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
  background-image: -moz-linear-gradient(bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
  background-image: -o-linear-gradient(bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
  background-image: -ms-linear-gradient(bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
  background-image: linear-gradient(bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4));
}