body {
        font-family: Arial, sans-serif;
        background-color: #f4f4f4;
        text-align: center;
        padding: 20px;
    }
    form {
        background: white;
        padding: 20px;
        margin: 20px auto;
        width: 300px;
        border-radius: 10px;
        box-shadow: 0px 0px 10px gray;
    }
    input, button {
        width: 100%;
        padding: 10px;
        margin: 5px 0;
    }