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angular - Changing style of overlay container

I use a git project for a virtual keyboard (https://ngx-material-keyboard.github.io/demo/). And I have some issues to get it running on a small device with 450*250 pixel.

At the end I found the necessary changes in the css if I modify it directly at the web browser with dev tools.

Now I have to find the right position to change the sources.

There will be used the overlay component from angular2-material to visualize the keyboard.

If I comment out the position in the cdk-overlay-container, it works:

.cdk-overlay-container {
/* position: fixed; */
z-index: 1000;

}

But I cant overwrite these from my angular application. Any suggestions?

Screenshot of changes

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UPDATED ANSWER

From the official documentation:

Styling overlay components

Overlay-based components have a panelClass property (or similar) that can be used to target the overlay pane.

You can override the default dialog container styles by adding a css class in your global styles.css. For example:

.custom-dialog-container .mat-dialog-container {
    /* add your styles */
}

After that, you'll need to providies you css class as a panelClass parameter to your dialog:

this.dialog.open(MyDialogComponent, { panelClass: 'custom-dialog-container' })

Read this official documentation for more information.


ORIGINAL ANSWER

Use ::ng-deep in your component.css to override the default styles.

::ng-deep .cdk-overlay-container {
    /* Do you changes here */
    position: fixed; 
    z-index: 1000;
}

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