.float {
  position: fixed;
  width: 60px;
  height: 60px;
  top: 50%;                     /* center vertically */
  left: 0;                      /* stick to left edge */
  transform: translateY(-50%);  /* adjust for perfect centering */
  background-color: #25d366;
  color: #FFF;
  border-radius: 50%;           /* make it circular */
  text-align: center;
  font-size: 30px;
  box-shadow: 2px 2px 6px #999;
  z-index: 1000;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.my-float {
  margin: 0; /* center the icon inside */
}