New to shaders, it seems to be rotated

[Tergel_Munkhdelger]

Hello, I’m learning about shaders using The Book of Shaders.

The colors displayed on the gl_FragCoord section seems to be rotated in way.
Am I doing something wrong here?

Current:

Expected:

Here is the shader code

const vShader = `
    varying vec2 v_uv;
    void main() {
        v_uv = uv;
        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
`;

const fShader = `
    varying vec2 v_uv;
    uniform vec2 u_resolution;

    void main() {
        vec2 uv = 2.0 * v_uv - 1.0; // between -1 and 1
        uv.x *= u_resolution.x / u_resolution.y;

        gl_FragColor = vec4(uv.x, uv.y, 0.0, 1.0);
    }
`;

[makc3d]

if you do uv = 2.0 * v_uv - 1.0 you have to undo this after you correct the aspect ratio.