Displaying a texture on one part of the screen

float4 Main(in float4 vpos : SV_POSITION, in float2 texcoord : TEXCOORD) : SV_TARGET
{
    const float2 overlay_pos = float2(10, 10); // Position in pixels from top left on the screen.
    const float2 overlay_size = float2(200, 200); // Size of the overlay texture in pixels on the screen.

    if (vpos.x > overlay_pos.x && vpos.x < (overlay_pos.x + overlay_size.x) &&
        vpos.y > overlay_pos.y && vpos.y < (overlay_pos.y + overlay_size.y))
    {
        return tex2D(overlay_texture, (vpos.xy - overlay_pos) / overlay_size);
    }
    else
    {
        return tex2D(ReShade::BackBuffer, texcoord);
    }
}

sampler CursorSampler
{
	Texture = CursorTex;
	AddressU = BORDER;
	AddressV = BORDER;
};