HTML_CSS_FULL_COURSE/buttons.html

<style>
  .subscribe-button {
    background-color: rgb(200, 0, 0);
    color: white;
    border: none;
    height: 36px;
    width: 105px;
    border-radius: 2px;
    cursor: pointer;
    margin-right: 8px;
    transition: opacity 0.15s;
  }
  
  .subscribe-button:hover {
      opacity: 0.8;
  }
  
  .subscribe-button:active {
      opacity: 0.5;
  }

  .join-button {
      background-color: rgb(255, 255, 255); 
      color: rgb(41, 118, 211);
      border-color: rgb(41, 118, 211);
      border-style: solid;
      border-width: 1px;
      height: 36px;
      width: 62px;
      border-radius: 2px;
      cursor: pointer; 
      transition: background-color 0.15s,
        color 0.15s;
  }

  .join-button:hover {
      background-color: rgb(41, 118, 211);
      color: rgb(255, 255, 255);
  }

  .join-button:active {
      opacity: 0.7;
  }

  .tweet-button {
      background-color: rgb(2, 158, 255);
      color: white;
      border: none;
      height: 36px;
      width: 70px;
      border-radius: 18px;
      font-weight: bold;
      font-size: 15px;
      cursor: pointer; 
      margin-left: 8px;
      transition: box-shadow 0.15s;
  }

  .tweet-button:hover {
      box-shadow: 5px 5px 10px rgba(0,0,0,.15);
  }

</style>

<button class="subscribe-button">
    SUBSCRIBE
</button>
<button class="join-button">
    JOIN
</button>
<button class="tweet-button">
    TWEET
</button>