* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #f4f6f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculator {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    width: 300px;
}

h2 {
    text-align: center;
}

input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
}

button {
    width: 100%;
    padding: 10px;
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}
.result {
    margin-top: 15px;
    padding: 10px;
    background: #e9ecef;
    border-radius: 4px;
    text-align: center;
}