# Screen with reduced alpha appears white instead transparent **URL:** \ **Category:** How to\ **Created:** [August 3, 2023, 1:35pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616 "2023-08-03T13:35:37Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 3, 2023, 1:35pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/1 "2023-08-03T13:35:37Z")
Hello, I want to display a screen on another screen with a reduced alpha for background in order to see on the new screen only the center panel, like a modal window. When I tried to do this the screen appear white insted of seeing the other screen. Is there a way to do this ? ---
**Author:** ![kisvegabor](http://forum.squareline.io/user_avatar/forum.squareline.io/kisvegabor/32/537_2.png) [@kisvegabor](http://forum.squareline.io/u/kisvegabor)\ **Post date:** [August 4, 2023, 10:04am UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/2 "2023-08-04T10:04:54Z")
Hi, You need to enable `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`. ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 4, 2023, 12:49pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/3 "2023-08-04T12:49:50Z")
Hello, It has changed the background color, now it appears black, but I do not see the previous screen in the background ? ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 4, 2023, 12:52pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/4 "2023-08-04T12:52:43Z")
I use this function to change the screen. C.\_ui\_screen\_change(C.ui\_UserConfirmationScreen, C.LV\_SCR\_LOAD\_ANIM\_FADE\_ON, 0, 0) I think that the bakground is reloaded when the screen is changed ---
**Author:** ![kisvegabor](http://forum.squareline.io/user_avatar/forum.squareline.io/kisvegabor/32/537_2.png) [@kisvegabor](http://forum.squareline.io/u/kisvegabor)\ **Post date:** [August 7, 2023, 8:45am UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/5 "2023-08-07T08:45:16Z")
Normally the screens should fully convert the display. Have you changed e.g. the `bg_opa` of a screen to make the prevoius screen visible? ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 7, 2023, 12:07pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/6 "2023-08-07T12:07:24Z")
YES BG color FFFFFF Alpha 0 ---
**Author:** ![Marian\_M](http://forum.squareline.io/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@Marian\_M](http://forum.squareline.io/u/Marian_M)\ **Post date:** [August 7, 2023, 12:10pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/7 "2023-08-07T12:10:53Z")
You cant have two screens on display , you need two panels ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 7, 2023, 12:31pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/8 "2023-08-07T12:31:09Z")
¨Peach. It isn’t easy to make a pop-up screen. I will have ten screen with this pop-up. Have I to do all in one screen with multiple panel ??? ---
**Author:** ![Marian\_M](http://forum.squareline.io/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@Marian\_M](http://forum.squareline.io/u/Marian_M)\ **Post date:** [August 7, 2023, 2:48pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/9 "2023-08-07T14:48:55Z")
Simply create dummy screen and on it one modal panel . In code then call set parent and move this panel over actual screen and back to dummy on hide. ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 7, 2023, 3:19pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/10 "2023-08-07T15:19:55Z")
Simply. But not so easy when I have to manage the touch action of each panel in each screen. I do not understand why lvgl redraw the background when the background alpha is set to 0. ??? ---
**Author:** ![Marian\_M](http://forum.squareline.io/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@Marian\_M](http://forum.squareline.io/u/Marian_M)\ **Post date:** [August 7, 2023, 3:46pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/11 "2023-08-07T15:46:59Z")
I mean panel is only one and event is handled on panel objects… ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 7, 2023, 3:51pm UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/12 "2023-08-07T15:51:04Z")
If it is possible to add code for component and it is automatically reproduce for each child, it will be nice. But i don’t know how to add code to component and not to child. Sorry. I’m neebie. ---
**Author:** ![Julien\_Nicola](http://forum.squareline.io/letter_avatar_proxy/v4/letter/j/f475e1/32.png) [@Julien\_Nicola](http://forum.squareline.io/u/Julien_Nicola)\ **Post date:** [August 8, 2023, 11:09am UTC](http://forum.squareline.io/t/screen-with-reduced-alpha-appears-white-instead-transparent/1616/13 "2023-08-08T11:09:51Z")
works perfectly C.lv\_obj\_set\_parent(C.ui\_UserInfoModal, C.ui\_HomeScreen) Thanks for the trick.