use 'dppx' units along with 'dpi'

Signed-off-by: Junliang Huang <i@jhuang.me>
update chosen-disabled to match bootstrap styles

Signed-off-by: Junliang Huang <i@jhuang.me>
unify the results horizontal padding

Signed-off-by: Junliang Huang <i@jhuang.me>