The gray border is the border of the container with the SVG object
.
Resize the window to test the SVG fluidity.
SVG as object
with fluid width
<object type="image/svg+xml" data="img/logo.svg">
<h3>Fallback text</h3>
</object>
.container {
border: 10px solid #b6bdc3;
width: 100%;
background: #fff;
margin: 0 auto;
}
/* Required to make image fluid in IE */
object {
width: 100%;
}