Here I have shared some more css modifications which you can enjoy if you are using theme Sight by WPshower, it is a free theme which u can use under wordpress.com and wordpress.org and the following css you can use in your custom css if you want to give it your choiceable look .
Here is the download link of the theme : Theme Sight by WPShower Download
You can use my shared code and ask question in the comments section.
All About Basic 