Edit the page by clicking Site Actions ➪ Edit Page.
Place your cursor in the main content area, and then click Insert ➪ Web Part from the ribbon.
From Categories, select Media and Content, and from Web Parts, select Content Editor, and then click Add
Select the web part and go to HTML Editor
Copy this code and past it same as what you see in the image
<style type="text/css">
/*--Hide Quick Launch --*/
#s4-leftpanel{
display:none
}
.s4-ca{
margin-left:0px
}
</style>
Click Ok
From the tool pane on the right, expand Appearance, change Chrome Type to None, and then click OK.
From the ribbon, click Save & Close to save the page.
Aryan Nava 