Angular components are experiencing issues with Material UI checkboxes due to CSS overrides

Currently, I have successfully overridden the CSS of a Material UI checkbox in my Home Component. However, this has caused some unintended side effects such as overriding the CSS of checkboxes in other components, like the form component. Does anyone have a solution for this issue?

Here is the HTML snippet used:

<mat-checkbox formControlName="home">
  Home
</mat-checkbox>

This is the CSS used to override the default grey color:

::ng-deep .mat-checkbox .mat-checkbox-frame {
border-color: blue !important;
}

Interestingly, without any additional CSS, the border color of the mat-checkbox in the Form component is also being overridden to blue.

<mat-checkbox formControlName="form">
  Form
</mat-checkbox>

It is suspected that the use of ::ng-deep may be causing this issue.

Attempts have been made using ViewEncapsulation in the Home component to resolve this problem, but it persists in both the Form component and other components. Any insights or solutions would be greatly appreciated.

Answer №1

If you want to apply a specific style only inside a particular child component, you can include the :host selector in the CSS code of that component like this:

:host ::ng-deep .mat-checkbox .mat-checkbox-frame {
  border-color: blue !important;
}

This method will limit the rule to affect only checkboxes within the current component and its children, making it ideal for routed components.

Alternatively, if you prefer to apply this CSS rule specifically to the home page template, you can use the following code snippet in your home.component.css:

.mat-checkbox ::ng-deep .mat-checkbox-frame {
  border-color: blue !important;
}

When Angular renders this, it will transform it into:

.mat-checkbox[_ngcontent-rvb-c0] .mat-checkbox-frame {
    border-color: blue !important;
}

Here, _ngcontent-rvb-c0 serves as a unique identifier for the current component.

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