In Angular2, how to make <app-root> 100% height

I am using Angular2 and I want to set the height of <app-root> to 100% of <body>.

Currently I have:

<body>
<app-root></app-root>
</body>


and in CSS file I've set:

app-root {
height: 100%;
}


but it seems nothing changed.

Do you have any idea?

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