I selected tiles-nested

when i click a photo and light box popup..

there is scroll bar in right side.

I want to hide scroll bar  when light box is pop up.

how  can I ?

thanks for your reply

netsed and column type has scroll bar when lightbox popup mode.

default mode has no scroll bar when lightbox popup mode.

I want to remove scroll bar on the right side end ..just when "lightbox" mode.

your css to the body tag: "overlfow-y:hidden"  is only for " lightbox "mode?

i wrote overlfow-y:hidden .. not work.  body {  overlfow-y:hidden } not work.

I wrote this in theme option it is worked.. 

html {

overflow-y: hidden;
}”

but this hide scroll bar all the time.

I want to hide just when ligjhtbox is on.

Is there any css code just when lightbox mode and for all pages ?

http://zizi24.cafe24.com/wp/

this is my website (test site yet) ( id - zizi24   password - zaq12wsx )

when you click a picture..  lightbox pop up ..   and the picture come up .. and all other back ground become black ..but the scroll bar on the right side is not become black but remain white as it was.

this is the picture that the scroll bar remain (i want to hide just when lightbox mode)

https://drive.google.com/file/d/1qgrmxzkL9ERUAat3X9SrSJID3KqZBQ98/view?usp=sharing

I wrote this css code in theme option. 

html {

overflow-y: hidden; }”

but this css code makes scroll bar always hide.

I want to hide scroll bar just when i click a picture (so the picture is popup in lightbox mode.)