.btn {
  border: 2;
  color: white;
  padding: 14px 28px;
  font-size: 16px;
  cursor: pointer;
}

.success {background-color: #003399;} /* Green */
.success:hover {background-color: #990000;}

.info {background-color: #2196F3;} /* Blue */
.info:hover {background: #0b7dda;}

.warning {background-color: #ff9800;} /* Orange */
.warning:hover {background: #e68a00;}

.danger {background-color: #f44336;} /* Red */ 
.danger:hover {background: #da190b;}

.default {background-color: #e7e7e7; color: black;} /* Gray */ 
.default:hover {background: #ddd;}/* CSS Document */