我正在使用来自FlatIcons的svg，当我导入它并且不要弄乱高度/宽度它看起来很好（但是太大）但是当我开始减小它的大小时，边界变得模糊并且不再尖锐。
e.g。 https://codepen.io/geraintf/pen/ZoaPPW
发生了什么事？如何缩放SVG以避免这种情况？
SVG：
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 52.966 52.966" style="enable-background:new 0 0 52.966 52.966;" xml:space="preserve">
<path d="M51.704,51.273L36.845,35.82c3.79-3.801,6.138-9.041,6.138-14.82c0-11.58-9.42-21-21-21s-21,9.42-21,21s9.42,21,21,21
c5.083,0,9.748-1.817,13.384-4.832l14.895,15.491c0.196,0.205,0.458,0.307,0.721,0.307c0.25,0,0.499-0.093,0.693-0.279
C52.074,52.304,52.086,51.671,51.704,51.273z M21.983,40c-10.477,0-19-8.523-19-19s8.523-19,19-19s19,8.523,19,19
S32.459,40,21.983,40z"/>
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</svg>