How to Hide Quick Launch in SharePoint 2013 Page

In this code you will see how to hide quick launch in SharePoint 2013 page. Add a script editor web part to a page in which quick launch has to be hidden and paste the below CSS.

CSS:

<style>
.ms-core-navigation {
    DISPLAY: none
}

#contentBox {
    margin-left: 0px
}
</style>