How do I align divs in simple HTML page - html

Question

I have this simple HTML template, I have added height instead of having content.
What I am after is to align "Delivery" and "Contact Us" div below "About Us" div and "Returns Policy" on the right as it is.
#import url(https://fonts.googleapis.com/css?family=News+Cycle);
body {
font-family: 'News Cycle', sans-serif;
color: #666;
line-height: 1.3;
}
strong,
b {
font-weight: 900;
}
h3 {
font-weight: bold;
border-bottom: 1px solid #e2e2e2;
}
p,
ul li {
font-size: 14px;
font-weight: lighter;
}
#logo,
#product {
float: left;
width: 100%;
}
#title,
#logo {
padding: 0 1% 0 1%;
margin: 1%;
}
#product_description,
#about_us,
#delivery,
#returns_policy,
#contact_us {
float: left;
width: 45%;
padding: 0 1% 0 1%;
margin: 1%;
border-radius: 5px;
border: 1px #e2e2e2 solid;
background-color: #f5fafa;
}
#product_image {
text-align: center;
}
<div id="logo">
</div>
<div id="product">
<div id="title">
<h1>XYZ</h1>
</div>
<div id="product_image">
</div>
<div id="product_description">
<h3>Product Description</h3>
</div>
</div>
<div id="about_us" style="height:600px;">
<h3>About Us</h3>
<div class="content">
</div>
</div>
<div id="delivery" style="height:200px;">
<h3>Delivery</h3>
<div class="content">
</div>
</div>
<div id="returns_policy" style="height:800px;">
<h3>Returns Policy</h3>
<div class="content">
</div>
</div>
<div id="contact_us" style="height:100px;">
<h3>Contact Us</h3>
<div class="content">
</div>
</div>

Answer 1

html:
<div id="logo">
</div>
<div id="product">
<div id="title">
<h1>XYZ</h1>
</div>
<div id="product_image">
</div>
<div id="product_description">
<h3>Product Description</h3>
</div>
</div>
<div class="leftCol">
<div id="about_us" style="height:600px;">
<h3>About Us</h3>
<div class="content">
</div>
</div>
<div id="delivery" style="height:200px;">
<h3>Delivery</h3>
<div class="content">
</div>
</div>
</div>
<div class="rightCol">
<div id="returns_policy" style="height:800px;">
<h3>Returns Policy</h3>
<div class="content">
</div>
</div>
<div id="contact_us" style="height:100px;">
<h3>Contact Us</h3>
<div class="content">
</div>
</div>
</div>
add to css
.leftCol { width: 50%; float: left; }
.rightCol { width: 50%; float: right; }