Angular does not adhere to globally defined styles

I have defined the margins for mat-expansion-panel in my styles.css file as follows:

mat-expansion-panel {
    margin: 2vh;
}

Unfortunately, these margins will not be applied to my components unless they are also specified in the local CSS file.

Even trying to import the global styles.css from the component directive does not work:

@Component({
  ...
  styleUrls: ['./list.component.css', '../../../styles.css']
})

This approach results in the following error:

./src/styles.css - Error: No template for dependency: CssDependency

Error: The loader ".../src/styles.css" didn't return a string

Answer №1

Consider using these styles in your styles.css file:

.mat-expansion-panel {
    margin: 2vh !important;
}

If you want to apply these styles to a specific expansion panel, you can either use a unique ID or assign a class to that individual expansion panel.

EXPLANATION: The issue here is that Angular Material automatically adds margins to the .mat-expansion-panel element, which overrides our custom styling. By using !important, we increase the importance (CSS specificity) of our CSS rule, ensuring it takes precedence over the default CSS style. https://i.sstatic.net/7hDG2.png

Check out this Stackblitz example for reference.

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