How to hide Quick launch in SharePoint 2013

Using CSS is the simple way to hide the Quick launch. Actually it hides the entire area of Quick launch is placed in, and gives you access to the whole areas width.

Simply add a Content Editor Web Part in the page and edit it with “Source Editor”.

<
style>
.ms-core-sideNavBox-removeLeftMargin{
 display:none !IMPORTANT;
}
#contentBox{
 margin-left:auto;
 margin-right:auto;
}
<
/style>