website elements get mixed up when browser gets readjusted - html

Question

I wrote a website for a travel based start up. It is a static website, not a responsive website. The code is here.
Code:
<div id="mainDiv" class="container">
<div id="header">
<div class="plc">
<h1></h1>
<nav>
<div id="navPos">
<div style="position: relative;right: 113px;">Register</div>
<div style="position: absolute;right: 255px;top: 37px;">Login</div>
<div style="position: absolute;top: 38px;right: 123px;">Market</div>
</div>
</nav>
</div>
</div>
<div id="body" class="container-fluid">
<div id="container">
<div id="overlay"></div>
<div id="menu"></div>
<div id="info">Fill your information here</div>
<div id="formPos"></div>
<div id="or">OR</div>
<div id="fbReg">
<img src="images/fbOne.png" id="fbIcon">
<div id="fbPos">Register with Facebook</div>
</div>
<div id="gReg">
<img src="images/gPlus.jpg" id="gIcon">
<div id="gPos">Register with Google</div>
</div>
<div id="cliPos">
<img src="images/Bistip-in-media.png" id="imgCli">
</div>
</div>
</div>
<div id="footer">
<div id="aboutUs">
About Us
</div>
<div id="aboutList">
<ul>
<li>About us</li>
<li>Media reviews</li>
<li>Bistip guide</li>
</ul>
</div>
<div id="accountInformation">
Account Information
</div>
<div id="accountList">
<ul>
<li>How to login</li>
<li>Create an account</li>
<li>Logout</li>
<li>Join us</li>
</ul>
</div>
<div id="marketInformation">
Market Information
</div>
<div id="marketList">
<ul>
<li>Shop</li>
<li>Shipping</li>
<li>My connection</li>
</ul>
</div>
</div>
</div>
Website in full screen browser appears like this:
Browser is resized like this:
You can see that elements are mixed up. How can I fix this?

Answer 1

This is because you are using position absolute in some elements.
You could try to use bootstrap.css and take off all the positions that you are using.