.button {
    padding: 10px 25px;
    border: unset;
    color: #f9f9f9;
    z-index: 1;
    background: #219A8E;
    position: relative;
    font-weight: 500;
    font-size: 16px;
    /* -webkit-box-shadow: 4px 8px 19px -3px rgba(0, 0, 0, 0.27);
    box-shadow: 4px 8px 19px -3px rgba(0, 0, 0, 0.27); */
    transition: all 250ms;
    overflow: hidden;
  }
  
  .button::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    border: 1px solid #219A8E;
    width: 0;
    background-color: #f9f9f9;
    z-index: -1;
    /* -webkit-box-shadow: 4px 8px 19px -3px rgba(0, 0, 0, 0.27);
    box-shadow: 4px 8px 19px -3px rgba(0, 0, 0, 0.27); */
    transition: all 250ms;
  }
  
  .button:hover {
    color: #219A8E;
  }
  
  .button:hover::before {
    width: 100%;
  }