jQuery Grid Plugin - jqGrid

Dear, good afternoon.

The question is pretty simple, but I've gone around the page Trirand but I could not find a way how to make the grid bigger.

Currently, I have a grid with jqGrid with Php but I fail to make the grid bigger, I've managed to make the columns bigger but not the grid

I know the question is novice, but haven't found it. I hope you can help me.

I also show them my php code, to see what I'm doing.

 

<?php
require_once 'jq-config.php';
// include the jqGrid Class
require_once "php/jqGrid.php";
// include the PDO driver class
require_once "php/jqGridPdo.php";
// Connection to the server
$conn = new PDO(DB_DSN,DB_USER,DB_PASSWORD);

// Create the jqGrid instance
$grid = new jqGridRender($conn);
// Write the SQL Query
// We suppose that mytable exists in your database
$grid->SelectCommand = "SELECT CONCAT(C.nombre,' ',C.apellido ) AS Nombre, G.Observacion, T.nombre Topico, 
If(G.Prioridad = 1, 'Alta',If( G.Prioridad = 2, 'Media','Baja')) Prioridad,
O.nombre Output, G.Fecha_Gap, G.Fecha_Cierre
FROM Colaboradores C, Gaps G, Topicos T, Outputs O
WHERE C.id = G.id_colaborador
AND T.id = G.id_topico
AND O.id = G.id_output";

// set the ouput format to json
$grid->dataType = 'json';
// Let the grid create the model
$grid->setColModel();
// Set the url from where we obtain the data
$grid->setUrl('myfirstgrid.php');
// Set grid caption using the option caption
$grid->setGridOptions(array(
    "caption"=>"GAP's De Auditoria Contabilidad y Finanzas",
    "rowNum"=>10,
    "sortname"=>"C.nombre",
    "rowList"=>array(10,20,50)
    ));

// Change some property of the field(s)
$grid->setColProperty("Nombre", array("width"=>"600")); 
$grid->setColProperty("Observacion", array("width"=>"1200")); 
$grid->setColProperty("Topico", array("width"=>"300")); 
$grid->setColProperty("Prioridad", array("width"=>"300")); 
$grid->setColProperty("Output", array("width"=>"300")); 
$grid->setColProperty("Fecha_Gap", array("width"=>"300")); 
$grid->setColProperty("Fecha_Cierre", array("width"=>"300")); 


// Run the script
$grid->renderGrid('#grid','#pager',true, null, null, true,true);
?>