.buttonStartOkHover {
  display: inline-block;
  padding:  20px 20px;
  font-size: 28px;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  outline: none;
  color: #fff;
  background-color:rgb(120,120,120);
  border: none;
  border-radius: 50px;
  box-shadow: 0 9px #999;
}

.buttonStartOkHover:hover {background-color:rgb(180,180,180) }  

.buttonStartOkHover:active {
  background-color: rgb(120,120,120);
  box-shadow: 0 5px #666;
  transform: translateY(4px);  
}