sed: To match a newline and spaces

I have a following file:

this is a title
  
    here goes a style sheet

I need to strip the ` element from it, with sed`. Currently I use

cat test.html | sed 's/.*//'

and it works, but I don't understand how to get rid of the blank line. That is, currently the output is

here goes a style sheet

Whereas I want it to be

here goes a style sheet

For this, I tried to add \s* or \n*, using both GNU and BSD sed,

cat test.html | sed 's/.*\s*//'

cat test.html | sed 's/.*\n*//'

but this didn't help. What I'm doing wrong? **Edit:** The `` line doesn't have to be on a separate line. That is, sometime the whole file can be just a single line:

this is a titlehere goes a style sheet

In such a case, the desired output is

here goes a style sheet