我在样式表中添加了自定义字体，并希望包含在SVG中，但它不会加载自定义字体。如何在SVG中添加自定义字体？以下是SVG代码：
<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" width="1024" height="768">
<defs>
<link href="fonts.css" type="text/css" rel="stylesheet" xmlns="http://www.w3.org/1999/xhtml"/>
</defs>
<g>
<title>background</title>
<rect x="-1" y="-1" width="100%" height="100%" id="canvas_background" fill="#fff"/>
<g id="canvasGrid" display="none">
<rect id="svg_2" width="100%" height="100%" x="0" y="0" stroke-width="0" fill="url(#gridpattern)"/>
</g>
</g>
<!-- Created with SVG-edit - http://svg-edit.googlecode.com/ -->
<g>
<title>background</title>
<rect fill="#fff" id="canvas_background" height="100%" width="100%" y="-1" x="-1"/>
<g display="none" id="canvasGrid">
<rect fill="url(#gridpattern)" stroke-width="0" y="0" x="0" height="100%" width="100%" id="svg_2"/>
</g>
</g>
<g>
<title>background</title>
<rect x="-1" y="-1" width="100%" height="100%" id="canvas_background" fill="#fff"/>
<g id="canvasGrid" display="none">
<rect id="svg_2" width="100%" height="100%" x="0" y="0" stroke-width="0" fill="url(#gridpattern)"/>
</g>
</g>
<g>
<title>Layer 1</title>
<text opacity="0.65" stroke="#000000" transform="matrix(0.323552, 0, 0, 1.60358, 525.282, -195.77)" xml:space="preserve" text-anchor="middle" font-family="gallardo" font-size="153.6" stroke-miterlimit="10" id="svg_2" y="482.50282" x="-67.52708" stroke-width="2" fill="#000000">We bring your ideas to print</text>
</g>
</svg>