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Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

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MadaShindeInai

// interface ensure class instance shape. Notice that the interface includes the parameters of the constructor, not the properties
interface Vehicle {
    make: string;
    color: string;
    doors: number;
    accelerate(speed: number): string;
    brake(): string;
    turn(direction: 'left' | 'right'): string;
}