Trick to Customize/Hide the default CSS Styles in Page for SharePoint

1st Option:

Reference: http://www.dhirendrayadav.com/2011/08/sharepoint-2010-tips-and-tricks-with.html

1. Click Edit the Page on the page where you need to apply the styles.
2. Add a “Content Editor" web part on the page and make it hidden.
3. Add the following code to the content editor web part (Edit HTML) where necessary.

01

<style>

02	/*--------Hide the columns--------*/

03	.ms-viewheadertr {

04	display: none;

05

}

06	/*---------Hide the Add Document option-------*/

07	.ms-addnew {

08	display: none;

09

}

10	/*---------Remove the new image icon on newly added documents-------*/

11	IMG.ms-newgif {

12	display:none;

13

}

14	/*---------Hide the web part selection checkbox------*/

15	.ms-WPHeaderTdSelection

16

{

17	display: none;

18

}

19

</style>

Note: If you want to set this settings for a whole sites, you should set this settings at your site CSS file.

2nd Option:

1. Open Windows Power Shell (SharePoint Server)
2. Add this command:

stsadm -o setproperty -pn days-to-show-new-icon -pv 42