修改svg顏色需要將svg作為內聯元素

  <article>
<a href="https://facebook.com/username" target="_blank">
  <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     width="30px" height="30px" viewBox="0 0 30 30" enable-background="new 0 0 30 30" xml:space="preserve"
 
>
   <path id="facebook" fill="#ffffff" d="M17.252,11.106V8.65c0-0.922,0.611-1.138,1.041-1.138h2.643V3.459l-3.639-0.015
    c-4.041,0-4.961,3.023-4.961,4.961v2.701H10v4.178h2.336v11.823h4.916V15.284h3.316l0.428-4.178H17.252z"/>
  </svg>
</a>

<a href="https://instagram.com/username" target="_blank"
 
>
  <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     width="30px" height="30px" viewBox="0 0 30 30" enable-background="new 0 0 30 30" xml:space="preserve">
   <path id="instagram" fill="#ffffff" d="M22.107,3.415H7.893c-2.469,0-4.479,2.007-4.479,4.477v4.73v9.486c0,2.469,2.01,4.479,4.479,4.479h14.215
    c2.469,0,4.479-2.01,4.479-4.479v-9.486v-4.73C26.586,5.421,24.576,3.415,22.107,3.415 M23.393,6.086l0.512-0.004v0.511v3.416
    l-3.916,0.014l-0.012-3.928L23.393,6.086z M11.693,12.622c0.742-1.028,1.945-1.7,3.307-1.7s2.564,0.672,3.307,1.7
    c0.484,0.67,0.771,1.49,0.771,2.379c0,2.248-1.828,4.078-4.078,4.078c-2.248,0-4.078-1.83-4.078-4.078
    C10.922,14.112,11.211,13.292,11.693,12.622 M24.328,22.107c0,1.225-0.994,2.219-2.221,2.219H7.893
    c-1.225,0-2.219-0.994-2.219-2.219v-9.486h3.459C8.832,13.356,8.664,14.159,8.664,15c0,3.494,2.842,6.335,6.336,6.335
    s6.336-2.842,6.336-6.335c0-0.842-0.17-1.645-0.467-2.379h3.459V22.107z"
 
/>
  </svg>
</a>
 
  
</a>
</article>

給fill賦予顏色即可改變