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Can't get some render to texture stuff get working

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My code (you can paste it in PIXI's examples)

I expect in a `smallScreen` in corner to show what's going on on stage.  But no :/

const app = new PIXI.Application();

const geometry = new PIXI.Geometry()
    .addAttribute('aVertexPosition', [-100, -50, 100, -50, 0, 100]);

const shader = PIXI.Shader.from(`

    precision mediump float;
    attribute vec2 aVertexPosition;

    uniform mat3 translationMatrix;
    uniform mat3 projectionMatrix;

    void main() {
        gl_Position = vec4((projectionMatrix * translationMatrix * vec3(aVertexPosition, 1.0)).xy, 0.0, 1.0);

`precision mediump float;

    void main() {
        gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);


const triangle = new PIXI.Mesh(geometry, shader);
const container = new PIXI.Container();

const rtt = PIXI.RenderTexture.create(200,200);
const smallSCreen = PIXI.Sprite.from(rtt);
smallSCreen.x = 0;
smallSCreen.y = 0;
smallSCreen.width = 100;
smallSCreen.height = 100;

triangle.position.set(400, 300);


app.ticker.add((delta) => {
    triangle.rotation += 0.01;
    app.renderer.render(container, rtt);


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Ehh, never mind, got the sizes wrong.. Somehave I was thinking that `app.renderer.render(container, rtt);` would squeeze the whole thing into 200, 200 render texture 

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