Spectrum Colorpicker Opening in Wrong place

HTML

<link rel="stylesheet" href="http://bgrins.github.com/spectrum/spectrum.css">
<button>Open</button>

CSS

button {
  position:absolute;
bottom: 10px;
 left: 40%;   
}

JavaScript

// Spectrum: The No Hassle Colorpicker
// https://github.com/bgrins/spectrum
// Author: Brian Grinstead
// License: MIT
// Requires: jQuery, spectrum.css

(function (window, $, undefined) {
    var defaultOpts = {
        color: '#000',
        flat: false,
        showInput: false,
        showButtons: true,
        showInitial: false,
        beforeShow: noop,
        move: noop,
        change: noop,
        show: noop,
        hide: noop,
        localStorageKey: false,
        showPalette: false,
        showPaletteOnly: false,
        showSelectionPalette: false,
        addSelectionToPalette: true,
        cancelText: "cancel",
        chooseText: "choose",
        className: "",
        preferredFormat: false,
        maxSelectionSize: 7,
        theme: 'sp-light',
        palette: ['fff', '000'],
        selectionPalette: []
    },
    spectrums = [],
    IE = $.browser.msie,
    replaceInput = [
        "<div class='sp-replacer'>",
            "<div class='sp-preview'></div>",
            "<div class='sp-dd'>&#9660;</div>",
        "</div>"
    ].join(''),
    markup = (function () {

        // IE does not support gradients with multiple stops, so we need to simulate            
        //  that for the rainbow slider with 8 divs that each have a single gradient
        var gradientFix = "";
        if (IE) {
            for (var i = 1; i <= 6; i++) {
                gradientFix += "<div class='sp-" + i + "'></div>";
            }
        }

        return [
            "<div class='sp-container'>",
                "<div class='sp-palette-container'>",
                    "<div class='sp-palette sp-thumb sp-cf'></div>",
                "</div>",
                "<div class='sp-picker-container'>",
                    "<div class='sp-top sp-cf'>",
                        "<div class='sp-fill'></div>",
                        "<div class='sp-top-inner'>",
                            "<div class='sp-color'>",
                                "<div...