How to show/hide a block with an arrow

Hello,

I like to create a block to display at the top region with an arrow. By default, block will be shown or hidden. I should be able to hide the block by clicking the up arrow. I also should be able to display the block by clicking the down arrow. 

How can I do it? Do you suggest any modules?

Thanks!

unable to place blocks

Hi all, on an old drupal installation, 8.9.20

Today I'm not able to place a block anywhere: when I click on "Place block", nothing happens, but I find the following log:

LogicException: Render context is empty, because render() was called outside of a renderRoot() or renderPlain() call. Use renderPlain()/renderRoot() or #lazy_builder/#pre_render instead. in Drupal\Core\Render\Renderer->doRender() (linea 243 di /home/customer/www/xxx/public_html/core/lib/Drupal/Core/Render/Renderer.php).

Add submission Values to the path /USER/{USER}/SUBMISSIONS

I use the webform views integration module. There is a nice video from Jacob Rockowitz at youtube.

But I'm not able to add submitted values to the views at this path "/USER/{USER}/SUBMISSIONS". At the path " /admin/structure/webform/ " the values are viewable. Is there a way to add the values to the desired path?

503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.

Hello,

I get the below error only when I go to below url

site-name.com/user/login

Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.

PluginNotFoundException

Having an issue with some pages are not loading as expected in Drupal and getting below error when click on the permission. 

input value in a view math expression field

Hello,

i'm using Drupal 8 in the latest stable version.

I try to let the user define a few input values like amount and price liter

The View allready has all the data, i just need to get these inputs in a math expression field in my view, so the user can see which is the most effective machine.

Example: User sets Amount to 5 and liter per hour to 20

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