css如何改变svg颜色

<svg width="8px" height="12px" viewBox="0 0 8 12" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 47.1 (45422) - http://www.bohemiancoding.com/sketch -->
    <title>Rectangle 8 Copy 10</title>
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round">
        <polyline id="Rectangle-8-Copy-10" stroke="#8F99AE" stroke-width="2" transform="translate(2.242641, 6.242641) scale(1, -1) rotate(-135.000000) translate(-2.242641, -6.242641) " points="5.24264069 9.24264069 -0.757359313 9.24264069 -0.757359313 3.24264069 -0.757359313 3.24264069"></polyline>
    </g>
</svg>

 svg g polyline {
    stroke: red;
}