How to Make Easy Fullscreen Responsive With HTML and CSS

Hi Everyone

NOW I will represent how to make very simple fullscreen responsive

Width 700px

Width 500px

Code HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, 
     initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    <header class="showcase">
        <h1>WELCOME</h1>
        <p>Lorem ipsum dolor sit amet consectetur 
            adipisicing elit. Laborum nisi, similique 
            libero rem dolore magni?
        </p>
        <a href="#" class="button">Read More</a>
    </header>
    <section class="section-a">
        <p>Lorem ipsum dolor sit amet consectetur 
            adipisicing elit. Sapiente aperiam 
            consequuntur itaque totam eum id alias, 
            quis nihil velit est deserunt reiciendis 
            delectus enim natus ut mollitia quod aut 
            illo ullam esse nemo. Sit natus 
            perspiciatis 
            ipsa ullam accusamus id, est placeat 
            eveniet 
            ipsum velit expedita illo aspernatur 
            voluptas 
            asperiores hic, dicta quisquam atque 
            quidem 
            dolorem nemo blanditiis cum? Molestiae, 
            pariatur 
            quam laboriosam magnam quaerat dolorum 
            perspiciatis! 
            Eius delectus aliquid excepturi quisquam 
            rerum deleniti 
            dolore, laborum vel sapiente maxime, 
            sequi repellat? 
            Minima nostrum mollitia a delectus, 
            alias voluptas, 
            ex veniam aspernatur quis odit atque 
            quibusdam sunt 
            et provident ea corrupti.
        </p>
    </section>
    <section class="section-b">
        <p>Lorem, ipsum dolor sit amet consectetur 
            adipisicing elit. Explicabo cumque eligendi 
            reiciendis dignissimos ea in eum, recusandae 
            culpa ad ullam nemo tempore aliquam quasi optio 
            maxime ducimus veniam possimus 
            magnam quia temporibus 
            minus corporis facere delectus 
            voluptatem! Mollitia, 
            distinctio repellat. Facere, nisi. 
            Laudantium odit eum 
            magni adipisci blanditiis ex veniam 
            mollitia fuga aliquid 
            reprehenderit consequatur voluptate 
            asperiores quisquam in, 
            dolorum molestias incidunt eos ipsam 
            ullam unde maxime 
            voluptas maiores possimus ipsa? Sunt 
            vero aliquam suscipit 
            et sint natus! Corrupti provident vel 
            a in eaque ex numquam enim. 
            Dignissimos eveniet animi doloribus 
            praesentium nostrum odit error 
            assumenda nulla, voluptatem 
            perferendis maiores.
        </p>
    </section>
    <section class="section-c">
        <div class="box-1">
            <p>Lorem ipsum dolor sit amet consectetur
                adipisicing elit. 
                Velit rerum accusamus inventore esse, 
                fugiat repudiandae 
                voluptate dicta eaque nobis hic!
            </p>
        </div>
        <div class="box-2">
            <p>Lorem ipsum dolor sit amet consectetur 
                adipisicing elit. 
                Velit rerum accusamus inventore esse, 
                fugiat repudiandae 
                voluptate dicta eaque nobis hic!
            </p>
        </div>
        <div class="box-3">
            <p>Lorem ipsum dolor sit amet consectetur 
                adipisicing elit. 
                Velit rerum accusamus inventore esse, 
                fugiat repudiandae 
                voluptate dicta eaque nobis hic!
            </p>
        </div>
    </section>
</body>
</html>

Code CSS

* {
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 17px;
    color: #926239;
    line-height: 1.6;
}

.showcase {
    background-image: url(img/1.jpg);
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}

.showcase h1 {
    font-size: 50px;
    line-height: 1.2;
}

.showcase p {
    font-size: 20px;
}

.showcase .button {
    font-size: 18px;
    text-decoration: none;
    color: #926239;
    border: #926239 1px solid;
    padding: 10px 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.showcase .button:hover {
    background: #926239;
    color: #fff;
}

.section-a {
    padding: 20px;
    background: #926239;
    color: #fff;
    text-align: center;
}

.section-b {
    padding: 20px;
    background: #f4f4f4;
    text-align: center;
}

.section-c {
    display: flex;
}

.section-c div {
    padding: 20px;
    text-align: center;
}

.section-c .box-1, .section-c .box-3 {
    background: #926239;
    color: #fff;
}

.section-c .box-2 {
    background: #f9f9f9;
}

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🎄Thanks and have a nice day🎄

DQmbg612fRjQcx9KfvCFx4S1DhNsYzirZ72L5tjyQiWUzFu_1680x8400.jpg