How To Add CSS To Only One Page

High guys i have created a landing page and have used the iconbox to create content. however I want the icons bigger on the one page. How can
I add this css code Into the code block of a page and get it to work correctly.
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.iconbox_top .iconbox_icon {font-size: 40px !important; height: 60px; width: 60px; line-height: 55px; top: -40px; left: 45%;}
.iconbox .iconbox_content .iconbox_content_title { margin: 15px 0 10px 0; }
.iconbox_top .iconbox_content { margin-top: 60px; }
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it tried thisin code block but could not see a difference in size.
<style type = “text/css”>
.iconbox_top .iconbox_icon {font-size: 40px !important; height: 60px; width: 60px; line-height: 55px; top: -40px; left: 45%;}
.iconbox .iconbox_content .iconbox_content_title { margin: 15px 0 10px 0; }
.iconbox_top .iconbox_content { margin-top: 60px; }
</style>
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However if I add the css code to quick CSS it works correctly but that also affects the whole site.

Your help would be appreciated.