Hey,
Just change this code
top .social_bookmarks .rss:hover {background-position: -47px center; background-color:#ffa133;}
#top .social_bookmarks .facebook:hover{background-position: -47px center; background-color:#37589b;}
#top .social_bookmarks .twitter:hover {background-position: -47px center; background-color:#46d4fe;}
#top .social_bookmarks .mail:hover {background-position: -47px center; background-color:#9fae37;}
#top .social_bookmarks .dribbble:hover{background-position: -47px center; background-color:#e44885;}
#top .social_bookmarks .linkedin:hover{background-position: -47px center; background-color:#419cca;}
#top .social_bookmarks .search:hover {background-position: -47px center; background-color:#222222;}
#top .social_bookmarks .gplus:hover {background-position: -47px center; background-color:#de5a49;}
to this code
/*top .social_bookmarks .rss:hover {background-position: -47px center; background-color:#ffa133;}
#top .social_bookmarks .facebook:hover{background-position: -47px center; background-color:#37589b;}
#top .social_bookmarks .twitter:hover {background-position: -47px center; background-color:#46d4fe;}
#top .social_bookmarks .mail:hover {background-position: -47px center; background-color:#9fae37;}
#top .social_bookmarks .dribbble:hover{background-position: -47px center; background-color:#e44885;}
#top .social_bookmarks .linkedin:hover{background-position: -47px center; background-color:#419cca;}
#top .social_bookmarks .search:hover {background-position: -47px center; background-color:#222222;}
#top .social_bookmarks .gplus:hover {background-position: -47px center; background-color:#de5a49;} */
You need to edit the actual images on wp-content\themes\sentence\images\layout then place this on your custom.css
#top .social_bookmarks li a{
width:42px;
line-height:30px;
}
Change the width and height value.
Regards,
Ismael