Align div left and right - html

Question

In the codes below, I have two <div> tags. I want to align one <div> to the left and the other to the right, with the same height and width. Please help me to do this.
<div id="imgShow">
<panel>
<img class = "hidden" id="orginal" alt = "Goofy pic of me" runat="server" />
<div id="ScrollImg" style="position:relative;width:900px; height:330px;overflow: scroll; top: 3px; left: -1px;left:auto">
<canvas id = "drawing" height="1500" width="1200" >
<p>Canvas not supported</p>
</canvas>
</div>
</panel>
</div>
<div id="divComplete" style="position:relative;width:100px; height:330px;overflow: scroll; top: 3px; right: -1px;right:auto"></div>

Answer 1

Set the floats for each div with CSS: example
.left { width:50%; float:left; height:200px; background:red;}
.right { width:50%; float: right; height:200px; background: blue;}

Answer 2

Try below code:
Demo
<div id="imgShow" style="width:50%; height:330px;overflow: scroll;float:left;">
<panel>
<img class = "hidden" id="orginal" alt = "Goofy pic of me" runat="server" />
<div id="ScrollImg">
<canvas id = "drawing" height="1500" width="1200" >
<p>Canvas not supported</p>
</canvas>
</div>
</panel>
</div>
<div id="divComplete" style="width:50%; height:330px;overflow: scroll;">Canvas not supported</div>

Answer 3

You should use floats:
<style>
#imgShow, #divComplete{
float:left;
width:50%;
}
</style>
If you want both at different widths, simply separate the css selectors and add the desired width.
PS: Avoid using inline CSS unless you need to, transfer these to a separate CSS file and include it in the head section

Answer 4

You can use twitter bootstrap css for styling your divs. Simply addclass="col-xs-6" to each div. Remember class="col-xs-12" is the full width that the div can take based on the width of the parent container. Using -xs- instead of -md- shrinks the div upon resize instead of knocking them down. If you want margins simply add change them to col-xs-5s then add a col-xs-2 div in between. It's also good practice to use parent divs with container-fluid and row classes