How can I override child component CSS properties in Angular 4 using ::ng-deep?

Overwriting Child Component CSS Properties with ::ng-deep in Angular 4

In Angular 4, the ::ng-deep selector allows you to override CSS properties of child components from within the parent component's CSS. This is achieved by piercing through the shadow DOM boundary of the child components.

Usage:

To use ::ng-deep, simply prepend it to the CSS selector that targets the child component's element, like this:

<code class="css">::ng-deep .child-component {
  /* CSS properties to override */
}</code>

Example:

Consider the following HTML structure:

<code class="html"><parent-component>
  <child-component class="child"></child-component>
</parent-component></code>

To override the styles of the p elements within the child-component, you can use the following CSS in the parent component:

<code class="css">::ng-deep .child p {
  color: red;
}</code>

IE11 Support:

::ng-deep is not supported in Internet Explorer 11. If you need to support IE11, you should use the alternate :host-context() selector instead. However, :host-context() has its own limitations and may not be suitable for all cases.

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