CSS: avoid line return with certain fonts
CSS: avoid line return with certain fonts

A tiny CSS change that enables having the bubble be only 2 lines instead
of 3 lines with some fonts (eg for nilearn)

sphinx-gallery/sphinx-gallery,Titan-C/sphinx-gallery,sphinx-gallery/sphinx-gallery,lesteve/sphinx-gallery,lesteve/sphinx-gallery,Eric89GXL/sphinx-gallery,Titan-C/sphinx-gallery,Eric89GXL/sphinx-gallery