It looks to me like you never defined a site in DW.
The reason I say that is because your .css file is showing a "local to your computer" file path. The only machine on the internet that can see your styles (what makes your text centered) is your machine.
In DW it's a critical first step to define a site
If you have defined a site correctly, the link to your css file should look like...
<link rel="stylesheet" type="text/css" media="screen" href="style.css" />
...rather than...
<link rel="stylesheet" type="text/css" media="screen" href="file:///G|/Desktop/HighwayQC/style.css" />
You will also then need to upload the .css file to the same location being referenced in the link (looks to likely be the root folder for your site). Right now, it doesn't appear to be uploaded, though it could be in a different location.