what is ngStyle directive? How to use ngStyle directive in Angular?

 ngStyle is a built-in Angular directive that allows you to dynamically set CSS styles on an HTML element based on the value of an expression in your component.

The ngStyle directive takes an object as its value, where the keys represent the CSS property names and the values represent the CSS property values. For example:

html
<div [ngStyle]="{'color': textColor, 'font-size': fontSize + 'px'}">Hello World!</div>

In this example, the ngStyle directive is used to set the color and font-size CSS properties on a div element. The values of these properties are determined by expressions in the component's class, namely textColor and fontSize.

You can also use the ngStyle directive with an object variable defined in your component. For example:

html
<div [ngStyle]="myStyles">Hello World!</div>

typescript
export class MyComponent {
  myStyles = {
    'color': 'red',
    'font-size': '20px'
  };
}

In this example, the ngStyle directive is bound to the myStyles object defined in the component. Any changes to the myStyles object will be reflected in the styles applied to the div element.

The ngStyle directive can be useful for applying dynamic styles based on user interactions or other state changes in your application. It is also more flexible than using the style attribute directly, as it allows you to apply multiple styles and use expressions to calculate their values.