style.css

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(to bottom, #87CEEB, #ADD8E6); /* Sky Blue gradient */
}

.calculator {
    background-color: #f0f0f0;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    width: 90%; /* Responsive width */
    max-width: 350px; /* Limit max width */
}

#display {
    width: calc(100% - 20px); /* Adjust width with padding */
    margin-bottom: 15px;
    padding: 10px;
    text-align: right;
    font-size: 2em;
    border: 1px solid #ccc;
    border-radius: 5px;
    outline: none;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

button {
    padding: 15px;
    font-size: 1.5em;
    border: none;
    background-color: #e0e0e0;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #d0d0d0;
}

button:active {
    background-color: #c0c0c0;
}