Помогите разобраться с правками в коде

Помогите разобраться с правками которые внесли по учебе. Так как верстала по макету но у куратора есть вопросы по коду. ссылка на фото https://ibb.co/NrGSyDy https://ibb.co/cvcxyrN https://ibb.co/cvcxyrN

* {
    margin: 0;
    padding: 0;
    font-size: 16px;
    font-weight: normal;
}
.container {
    max-width: 1105px;
    margin: 0 auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 40px auto;
}

.nav-li {
    display: inline-block ;
}

.nav-li:not(:last-of-type) {
    margin-right: 90px;
}

.nav-link {
    color: black;
    text-decoration: none;
}

.nav-link:hover {
    color: orangered ;
}
.app {
    background-image: url('../img/Rectangle\ 48.png');
    color: white;
    text-align: center;
    padding: 80px 0 162px;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center ;
}

.app-petitle {
    font-weight: bold;
    font-size: 24px;
    line-height: 36px;
}

.app-title {
    font-weight: bold;
    font-size: 58px;
    line-height: 80px;
    max-width: 650px;
    margin: 10px auto;
}

.app-text {
    font-weight: 500;
    font-size: 24px;
    margin-bottom: 57px;
}

.button {
    width: 236px;
    height:68px ;
    color: white;
    border-radius: 30px;
    font-weight: bold;
    font-size: 24px;
    line-height: 36px;
}

.button:first-of-type {
    background:orangered ;
    border: 1px solid orangered ;
    margin-right: 67px;
}

.button:last-of-type {
    background: none;
    border: 1px solid white;   
}

.order {
    background-image: url( '../img/Rectangle\ 47.png');
    color: white;
    text-align: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center ;
    padding: 141px 0 130px;
}

.order-title {
    font-weight: bold;
    font-size: 40px;
    line-height: 57px;
}

.order-text {
    font-weight: 500;
    font-size: 24px;
    line-height: 38px; 
}

.order-button {
    height: 64px;
    line-height: 28px;
    border-radius: 10px;
    color: white;
}

.order-button:first-of-type {
    background:orangered ;
    border: 1px solid orangered;
    width: 142px;
    margin-right: 16px;
}

.order-button:last-of-type {
    background: none;
    border: 1px solid white;
    width: 143px;
}

.mobile {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 110px;
}

.mobile-pretitle {
    font-weight: bold;
    font-size: 24px;
    line-height: 36px;
    color: orangered;
}

.mobile-title {
    font-weight: bold;
    font-size: 40px;
    line-height: 57px;
    max-width:560px; 
}

.mobile-text {
    font-weight: 500;
    font-size: 24px;
    line-height: 38px;
    color: black;
    max-width: 400px;
}

.title {
    font-weight: 600;
    font-size: 44px;
    line-height: 36px;
    text-align: center;
    margin: 56px 0 70px;
}

.container-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 40 auto;
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style/style.css">
</head>
<body>
    <header class="container header">
        <a href="#">
            <img src="img/logo.png" alt="логотип">
        </a>
        <nav>
            <ul>
                <li class="nav-li">
                    <a class="nav-link" href="#">Home</a>
                </li>
                <li class="nav-li">
                    <a class="nav-link" href="#">Product</a>
                </li>
                <li class="nav-li">
                    <a class="nav-link" href="#">Faq </a>
                </li>
                <li class="nav-li">
                    <a class="nav-link" href="#">Contact</a>
                </li>          
            </ul>
        </nav>
    </header>
    <section class="app"> 
        <div class="container">
                <h6 class="app-petitle">Restaurant app</h6>
                <h1 class="app-title">Why stay hungry when you can order form Eats  </h1>
                <p class="app-text"> Order in exchange for hunger</p>
            <div>
                <button class="button">Dilivery</button>
                <button class="button">Menu</button>
            </div>
        </div>
    </section >
    <section class="container">
        <h2 class="title">How the app works</h2>
        <div class="mobile">
            <div> 
                <img src="img/IMG_0851.png" alt="картинка">
                <div>
                    <p class="mobile-pretitle">
                        Create an account
                    </p>
                    <h3 class="mobile-title">Create/login to an existing account to get started</h3>
                    <p class="mobile-text">
                        An account is created with your email
                        and a desired password
                    </p>
                </div>
            </div>
        </div>
    </section>
    <div class="container">
        <div class="mobile">
            <div>
                <p class="mobile-pretitle">
                    Explore varieties
                </p>
                <h3 class="mobile-title">Shop for your favorites meal as e dey hot.</h3>
                <p class="mobile-text">
                    Shop for your favorite meals or drinks
                    and enjoy while doing it.
                </p>
            </div>
            <div> 
                <img src="img/IMG_0850.png" alt="фото">
            </div>
        </div>
        <section class="order">
            <div class="container">
                <h4 class="order-title">Order now.</h4>
                <p class="order-text">Available on your favorite store. Start your premium experience now</p>
                <div>
                    <button class="order-button">Playstore</button>
                    <button class="order-button">Appstore</button>
                </div>
            </div>
        </section>
    </div>
    <footer class="container-footer">
        <div class="logo">
            <p>Copywright 2020 Bella Onojie.com</p>
            <a href="#">
                <img src="img/logo.png" alt="логотип">
            </a>
        </div>
    </footer>
</body>
</html>


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