<!DOCTYPE html>
<meta charset="utf-8">
<style>

    .link {
        fill: none;
        stroke: #666;
        stroke-width: 1.5px;
    }

    .nostroke {
        fill: currentColor;
        stroke: none;
    }

    text {
        font: 10px sans-serif;
        pointer-events: none;
        text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
    }

</style>
<body>   
    <svg width="100%" height="600">
        <defs>
            <g id="class-symbol"><circle r="8" class="nostroke"/></g>
   