CSS3 - Desenhar seta com polyline

<style>
    .seta-polyline-link {
        width:40px; 
        height:40px; 
        background:#444; 
        display:block;}
        
    .seta-polyline-link {
        fill:none; 
        stroke:#FFF; 
        stroke-width:1;}
</style>
<a href="#" class="seta-polyline-link">
    <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
        <polyline class="seta-polyline" points="15,19 27,19 23,15 27,19 23,23" />
    </svg>
</a>

Resultado: