body {

    font-family: Arial;

    background: #f5f5f5;

    padding: 40px;
}

.container {

    background: white;

    width: 420px;

    margin: auto;

    padding: 30px;

    border-radius: 10px;

    box-shadow:
        0 0 15px rgba(0,0,0,0.1);
}

input,
#number-container,
#securityCode-container {

    width: 100%;

    padding: 12px;

    margin-bottom: 15px;

    border: 1px solid #ccc;

    box-sizing: border-box;

    border-radius: 5px;
}

button {

    width: 100%;

    padding: 14px;

    border: none;

    background: #1565c0;

    color: white;

    font-size: 16px;

    border-radius: 5px;

    cursor: pointer;
}

button:hover {

    opacity: 0.9;
}