Create modal popup

modal.php

$(function(){
	$("#modal-launcher, #modal-background, #modal-close").click(function () {
		$("#modal-content,#modal-background").toggleClass("active");
	});
});

    #modal-background {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: white;
        opacity: .50;
        -webkit-opacity: .5;
        -moz-opacity: .5;
        filter: alpha(opacity=50);
        z-index: 1000;
    }
    
    #modal-content {
        background-color: white;
        border-radius: 10px;
        -webkit-border-radius: 10px;
        -moz-border-radius: 10px;
        box-shadow: 0 0 20px 0 #222;
        -webkit-box-shadow: 0 0 20px 0 #222;
        -moz-box-shadow: 0 0 20px 0 #222;
        display: none;
        height: 240px;
        left: 50%;
        margin: -120px 0 0 -160px;
        padding: 10px;
        position: absolute;
        top: 50%;
        width: 320px;
        z-index: 1000;
    }

    #modal-background.active, #modal-content.active {
        display: block;
    }
    
    <button id="modal-launcher">Launch Modal Window</button>

<div id="modal-background"></div>
<div id="modal-content">
    <button id="modal-close">Close Modal Window</button>
</div>