DOC: tweak css style
DOC: tweak css style

spacetelescope/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,spacetelescope/asv,qwhelan/asv,airspeed-velocity/asv,qwhelan/asv,airspeed-velocity/asv,spacetelescope/asv,spacetelescope/asv,airspeed-velocity/asv