Blurry full-size navigation is a modern navigation concept. It helps you to create a full-sized navigation menu and blurs the background using CSS blur filter. jQuery is used to toggle CSS classes only whenever navigation is opened or closed.

<div class="screen">
  <header>
    <a class="target-burger">
      <ul class="buns">
        <li class="bun"></li>
        <li class="bun"></li>
      </ul>
      <!--buns-->
    </a>
    <!--target-burger-->
  </header>
  <nav class="main-nav" role="navigation">
    <ul>
      <li><a href=""><span>My Account</span></a></li>
      <li><a href=""><span>Billing Information</span></a></li>
      <li><a href=""><span>Order Tracker</span></a></li>
      <li><a href=""><span>Change Password</span></a></li>
      <li><a href=""><span>Log Out</span></a></li>
    </ul>
  </nav>
  <!--main-nav-->
  <div class="container">
    <div class="app-content">
      <ul class="content-list">
        <li>
          <article>
            <figure>
              <img src="https://unsplash.imgix.net/photo-1428930377079-45a584b6dd6b?dpr=2&fit=crop&fm=jpg&h=1575&q=75&w=1050" alt="The Jim Lewis Dalaman Briefcase">
              <figcaption>
                <span class="category">Accessories</span>
                <h1>Eli DeFaria Dalaman</h1>
                <span class="price"> &pound;255</span>
              </figcaption>
            </figure>
          </article>
        </li>
      </ul>
      <!--content-list-->
    </div>
    <!--app-content-->
  </div>
  <!--contaienr-->
</div>
<!--screen-->

See the Pen Frosty Nav Toggle Effect by Graham Wilsdon (@GrahamWilsdon) on CodePen.