Submenu child is not visible.

Hi @alok_singh, Applied your MR. The MR doesn’t applied successfully . I got below error applying the MR.
Checking patch css/custom-media.css...
error: while searching for:
text-transform: uppercase;
font-size: 16px;
}

.main-header nav{
margin: 0;
padding: 0;

error: patch failed: css/custom-media.css:39
error: css/custom-media.css: patch does not apply
Checking patch industrial_zymphonies_theme.info.yml...
error: while searching for:
type: theme
description: 'Designed & Developed by Zymphonies
Contact us for any kind of Drupal services info@zymphonies.com'
package: core
# core: 8.x
#Libraries
libraries:
- industrial_zymphonies_theme/bootstrap

error: patch failed: industrial_zymphonies_theme.info.yml:2
error: industrial_zymphonies_theme.info.yml: patch does not apply

I think your MR have 2 changes including info.yml changes. info.yml changes doesn't needed for this issue. I have tried your changes on the custom-media.css. But still issue doesn't fixed.

@Rinku Jacob 13
Thanks for your response
Please check which i attach 3348618.patch file this will work, and that MR is also works.
and that .info.yml file change for version control and for base theme.

Verified MR6 and #6 patch, still seeing the issue.