Reply To: Color of menu text, Checkout text and columns of forms

2. Here is a custom CSS code to change this text properties

p.woocommerce-thankyou-order-received {
    font-size: 20px!important;
    color: #8a0e0e;
    background: #d6d6d6!important;
}

As for its content so are able to change with Loco Translate as shown in the video.

3. You can import this page in Dummy Content and use its layout for your purpose. After import you will find it in Dashboard -> Pages.