How to add css in experience fragment and also how to resize experience fragment in page created using editable template.

Hi all,

I am new to aem and trying to include experience fragment in my page that i created using editable template and when i am trying to add it into the page the positioning of the content of the experience fragment becomes distorted from the original one and also i am not able to resize the experience fragment used in the page.

so is there anything that i am doing wrong.