我目前正在为一家公司建立一个响应式网站，但在平板电脑和手机上，我的固定导航栏会隐藏我的内容/跳过它们，而我希望在切换时它能将"内容"向下推。此外，我的.headerplace类在移动设备上会隐藏.bannerplace。如果您能帮我解决这个问题，我会非常感激。链接到https://jsfiddle.net/wy38hy37/13/。
<!Doctype html>
<title>NK Electrical LTD</title>
<body>
<div class="container">
<header class="headerplace">
<div class="logo">
<img src="http://s15.postimg.org/q1sf0zvsb/nklogo.png" alt="NK Electrical LTD Logo">
</div>
<nav class="navigation">
<li><a href="#home.html">Home</a></li>
<li><a href="#electrical.html">Electrical Installations</a></li>
<li><a href="#lighting.html">Lighting</a></li>
<li><a href="#appliances.html">Home appliances</a></li>
<li><a href="#about.html">About us</a></li>
<li><a href="#contact.html">Contact us</a></li>
</nav>
<a id="i-nav" href="#"></a>
</header>
<div class="bannerplace">
</div>
<div class="content-row group">
<div class="primary-content col">
<img class="headlineimg" src="http://s10.postimg.org/yvwknf09l/logoone.png"alt="Electrical logo"><h2>Electrical Installations</h2>
<hr>
<p>A house, a factory and generally every building has a life span of 40-50 years. The electrical installation for such a building will be designed and implemented only once, and should work reliably within time. The importance of the electrical installation process is of equal importance so as to be able to support the necessities of this amount of time within the years to come and not just of today. Therefore, due to this specific element, the electrical installation requires: experience, technical knowhow, excellent organizational structure and for sure an after sale service.</p>
<p>In ΝΚ Electrical Ltd we have placed in action our past experiences, continuously trying to line up with technology reaching a high expectation limit in organizational behavior, but most of all we value the after sale service that mantles a serious part of the puzzle called electrical installations.</p>
<button class="btn-action" type="submit">Book a table</button>
</div>
<div class="primary-content col">
<img class="headlineimg" src="http://s29.postimg.org/4jne5no53/emergency.png"alt="Electrical logo"><h2>24/7 Emergency Service</h2>
<hr>
<p>A house, a factory and generally every building has a life span of 40-50 years. The electrical installation for such a building will be designed and implemented only once, and should work reliably within time. The importance of the electrical installation process is of equal importance so as to be able to support the necessities of this amount of time within the years to come and not just of today. Therefore, due to this specific element, the electrical installation requires: experience, technical knowhow, excellent organizational structure and for sure an after sale service.</p>
<p>In ΝΚ Electrical Ltd we have placed in action our past experiences, continuously trying to line up with technology reaching a high expectation limit in organizational behavior, but most of all we value the after sale service that mantles a serious part of the puzzle called electrical installations.</p>
<button class="btn-action" type="submit">Book a table</button>
</div>
<div class="secondary-content col">
<img class="headlineimg" src="http://s29.postimg.org/hp2wbri0n/lighting.png"alt="Electrical logo"><h2>Lighting</h2>
<hr>
<p>A house, a factory and generally every building has a life span of 40-50 years. The electrical installation for such a building will be designed and implemented only once, and should work reliably within time. The importance of the electrical installation process is of equal importance so as to be able to support the necessities of this amount of time within the years to come and not just of today. Therefore, due to this specific element, the electrical installation requires: experience, technical knowhow, excellent organizational structure and for sure an after sale service.</p>
<p>In ΝΚ Electrical Ltd we have placed in action our past experiences, continuously trying to line up with technology reaching a high expectation limit in organizational behavior, but most of all we value the after sale service that mantles a serious part of the puzzle called electrical installations.</p>
<button class="btn-action" type="submit">Book a table</button>
</div>
<div class="third-content col">
<img class="headlineimg" src="http://s15.postimg.org/8alw76z6z/homeappliances1.png"alt="Home Appliances 1"><h2>Home Appliances</h2>
<hr>
<p>A house, a factory and generally every building has a life span of 40-50 years. The electrical installation for such a building will be designed and implemented only once, and should work reliably within time. The importance of the electrical installation process is of equal importance so as to be able to support the necessities of this amount of time within the years to come and not just of today. Therefore, due to this specific element, the electrical installation requires: experience, technical knowhow, excellent organizational structure and for sure an after sale service.</p>
<p>In ΝΚ Electrical Ltd we have placed in action our past experiences, continuously trying to line up with technology reaching a high expectation limit in organizational behavior, but most of all we value the after sale service that mantles a serious part of the puzzle called electrical installations.</p>
<button class="btn-action" type="submit">Book a table</button>
</div>
<div class="third-content col">
<img class="headlineimg" src="http://s2.postimg.org/khlogvand/homeappliances2.png"alt="Home Appliances 2"><h2>Home Appliances</h2>
<hr>
<p>A house, a factory and generally every building has a life span of 40-50 years. The electrical installation for such a building will be designed and implemented only once, and should work reliably within time. The importance of the electrical installation process is of equal importance so as to be able to support the necessities of this amount of time within the years to come and not just of today. Therefore, due to this specific element, the electrical installation requires: experience, technical knowhow, excellent organizational structure and for sure an after sale service.</p>
<p>In ΝΚ Electrical Ltd we have placed in action our past experiences, continuously trying to line up with technology reaching a high expectation limit in organizational behavior, but most of all we value the after sale service that mantles a serious part of the puzzle called electrical installations.</p>
<button class="btn-action" type="submit">Book a table</button>
</div>
</div>
<footer class="footerplace">
<p>©2016. NK Electrical LTD</p>
</footer>
</div>
</body>