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HTML

              
                <main>
  
  <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Quae aut, libero, saepe hic, provident cupiditate blanditiis distinctio similique veniam amet temporibus error asperiores aspernatur quos architecto aliquam. Minima, reiciendis pariatur.</p>
  
  <section class="full-width">
    <div class="full-width-inside">
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Non odit, labore nisi laborum doloribus quia praesentium officia quis, quibusdam accusamus quas hic quam consequuntur impedit! Provident unde aliquam blanditiis cumque?</p>
    </div>
  </section>
  
  <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Quae aut, libero, saepe hic, provident cupiditate blanditiis distinctio similique veniam amet temporibus error asperiores aspernatur quos architecto aliquam. Minima, reiciendis pariatur.</p>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Laborum ex minima dolorem enim sequi atque totam recusandae dolor! Natus distinctio alias sequi vel doloribus repudiandae, ea accusantium sapiente quidem reiciendis.</p>
  <p>Quas repudiandae ex voluptatum libero similique alias ipsa ullam, fugit deserunt unde aliquid dolor sapiente magni officia tempore quos aperiam officiis placeat. Quos sint rem enim culpa praesentium, debitis labore.</p>
  <p>Quos ipsa architecto corporis sunt dignissimos. Dolor maxime quasi voluptates itaque mollitia dolores ea iure minima sit ipsa rem, quidem dolorum at temporibus veritatis. Beatae iusto iure quaerat architecto porro.</p>
  <p>Officiis facilis deserunt reiciendis quos suscipit, accusantium alias excepturi eveniet expedita esse cumque, quis eaque explicabo quas! Accusantium cupiditate consequuntur laborum officiis obcaecati assumenda? Debitis nam impedit quaerat pariatur cum?</p>
  <p>Voluptas suscipit dolore non, cumque dolorum alias esse nam at dolorem qui aliquam maxime sint inventore repellendus assumenda quo accusantium. Repellat fugiat eos temporibus molestias dolor dicta, iste odit expedita?</p>
  <p>Delectus iste ipsum tempora consectetur blanditiis nesciunt! Mollitia eaque optio odit corporis blanditiis, autem ipsa dolorum cupiditate a. Facere quia tempore eligendi numquam aspernatur ad cum voluptatem, sit quos dolore.</p>
  <p>Explicabo modi consectetur, provident quod asperiores placeat ad deserunt quibusdam veniam eligendi natus architecto recusandae et nemo fugit itaque quae, maxime adipisci, in perferendis voluptas ex ipsum exercitationem? Hic, eos.</p>
  <p>Nostrum sapiente accusantium ea eaque officiis voluptatum odit. Fugiat incidunt nulla accusantium consequuntur soluta quisquam dolores tenetur ipsa velit quis perspiciatis vitae, veritatis aut. Tempore tenetur iusto ratione molestiae in!</p>
  <p>Non tenetur eos maiores voluptatibus necessitatibus repudiandae delectus accusamus, inventore pariatur dolore aspernatur obcaecati vero voluptatem quo ab sint corporis eveniet nobis mollitia architecto asperiores excepturi. Exercitationem labore error vel.</p>
  <p>Laudantium, ea aliquid molestias, veniam asperiores rerum excepturi eveniet pariatur et quia saepe porro praesentium qui, temporibus rem veritatis? Laboriosam numquam sit animi repellendus quod eos? Inventore placeat perspiciatis ad.</p>
  
</main>
              
            
!

CSS

              
                body {
  --contentWidth: 400px;
  padding: 1rem;
  scrollbar-width: 20px;
}
body::-webkit-scrollbar {
  width: 20px;
}
body::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
}
 
body::-webkit-scrollbar-thumb {
  background-color: darkgrey;
  outline: 1px solid slategrey;
}
.full-width {
  background: lightcoral;
  width: calc(100vw - 20px);
  margin-left: 50%;
  transform: translateX(-50%);
  padding: 1rem 0;
}
main, .full-width-inside {
  max-width: var(--contentWidth);
  margin: 0 auto;
}
.full-width-inside {
  padding-left: 1rem;
  padding-right: 1rem;
}



              
            
!

JS

              
                
              
            
!
999px

Console