Tweak padding for td-box mainly for mobile
Tweak padding for td-box mainly for mobile

Signed-off-by: Takuya Noguchi <b6ff22f4ae6fe3ca1371a0ef8d104f1c4bca551b@gmail.com>

google/docsy,grpc/grpc.io-docsy,google/docsy,grpc/grpc.io-docsy