body {
    display:flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(to bottom right, #3a0ca3, #240046);
    font-family: Arial, sans-serif;
}

.calculator {
    width: 260px;
    background-color: #1c1b29;
    border-radius: 5px;
    padding: 15px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.5);
}

.display-box {
    width: 85%;
    padding: 15px;
    font-size: 1.5em;
    text-align: right;
    border: none;
    background-color: #2d2a4b;
    color: #ffffff;
    border-radius: 5px;
}

.calculator input[type="button"] {
    width: 100%;
    padding: 20px;
    margin: 5px;
    font-size: 1.2em;
    color: #ffffff;
    background-color: #4a4e69;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s;
}

.calculator input[type="button"]:hover {
    background-color: #9a8c98;
}

#btn {
    background-color: #9a8c98;
}

#btn:hover {
    background-color: #d4a5a5;
}