.calculator {
display: flex;
flex-direction: column;
max-width: 300px;
margin: 0 auto;
}
input {
padding: 5px;
margin-bottom: 10px;
}
button {
padding: 10px 20px;
background-color: #007bff;
color: #fff;
border: none;
cursor: pointer;
}
button:hover {
background-color: #0056b3;
}