Syntax Error on token 'class' @ expected [JAVA - LWJGL]

I've got an error whilst coding one of my classes.

My imports are,

import static org.lwjgl.opengl.GL11.GL_COLOR_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_MODELVIEW;
import static org.lwjgl.opengl.GL11.GL_PROJECTION;
import static org.lwjgl.opengl.GL11.glClear;
import static org.lwjgl.opengl.GL11.glLoadIdentity;
import static org.lwjgl.opengl.GL11.glMatrixMode;
import static org.lwjgl.opengl.GL11.glOrtho;

import java.util.Random;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;

public class InputDemo{

public InputDemo(){

    int height = 720;
    int width = 1280;

    try {
        Display.setDisplayMode(new DisplayMode(1280, 720));
        Display.setTitle("Input Demonstration");
        Display.create();
    } catch (LWJGLException e) {
        e.printStackTrace();
    }

    //Initialization code OpenGL
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, 1280.0, 720.0, 0.0, 1.0, -1.0);
    glMatrixMode(GL_MODELVIEW);


    while(!Display.isCloseRequested()) {

    //Render (Quads are X, Y (Across, Up + Down))

        glClear(GL_COLOR_BUFFER_BIT);

        if(Keyboard.isKeyDown(Keyboard.KEY_ESCAPE))
        {
            Display.destroy();
            System.exit(0);
        }
        int dx = Mouse.getDX();
        int dy = -Mouse.getDY();
        System.out.println(dx + ", " + dy);

        Display.update();
        Display.sync(60);
    }
    Display.destroy();
}

private static class Box{
    public int x, y;
    public boolean selected = false;
    private float colorRed, colorBlue, colorGreen;

    Box(int x, int y)
    {
        this.x = x;
        this.y = y;

        Random randomGenerator = new Random();
        colorRed = randomGenerator.nextFloat();
        colorBlue = randomGenerator.nextFloat();
        colorGreen = randomGenerator.nextFloat();
    }

    boolean inBounds(in