use css. margin or padding. - http://www.w3schools.com/css/css_boxmodel.asp It is also possible to use negative values for margins; to overlap content. http://www.w3schools.com/css/css_margin.asp
For getting help perfectly, you should share resource and image screen shot, that will ensure better understanding and we will able to give good suggestion also.
Please share either screenshot or links. It seems height issue too me. Try to fix the height, if that does not work then go for margin,padding