.bttn {
  background-color: slateblue;
  color: white;
  font-weight: bold;
  padding: 13px 28px;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 0 7px grey;
  cursor: pointer;
}
.bttn:hover {
  background-color: #ada3e7;
  /*color: black;*/
}
.bttn-round {
  border-radius: 30px;
}
.bttn-square {
  border-radius: 3px;
}