Does height and width not apply to span?

Source: https://stackoverflow.com/questions/2491068/does-height-and-width-not-apply-to-span

Span is an inline element. It has no width or height.

You could turn it into a block-level element, then it will accept your dimension directives.

span.product__specfield_8_arrow
{
    display: block; /* or inline-block */
}