.btn {
    position: fixed; 
    bottom: 20px; 
    right: 20px; 
    background-color: #0bbc29; 
    color: #fff; 
    border: none; 
    border-radius: 40%; 
    padding: 10px; 
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);  
    z-index: 1000; 
    transition: background-color 0.3s; 
}

.btn:hover {
    background-color: #00ff44; 
}