Vertical alignment of text and icon in button

I'm having trouble vertically aligning a font-awesome icon with text within a button under the Bootstrap framework. I've tried so many things including setting the line-height, but nothing is working.

<button id="edit-listing-form-house_Continue" 
        class="btn btn-large btn-primary"
        style=""
        value=""
        name="Continue"
        type="submit">
    Continue
    <i class="icon-ok" style="font-size:40px;"></i>
</button>

http://jsfiddle.net/fPXFY/

How can I get this to work?

There is one rule that is set by font-awesome.css, which you need to override.

You should set overrides in your CSS files rather than inline, but essentially, the icon-ok class is being set to vertical-align: baseline; by default and which I've corrected here:

<button id="whatever" class="btn btn-large btn-primary" name="Continue" type="submit">
    <span>Continue</span>
    <i class="icon-ok" style="font-size:30px; vertical-align: middle;"></i>
</button>

Example here: http://jsfiddle.net/fPXFY/4/ and the output of which is:

I've downsized the font-size of the icon above in this instance to 30px, as it feels too big at 40px for the size of the button, but this is purely a personal viewpoint. You could increase the padding on the button to compensate if required:

<button id="whaever" class="btn btn-large btn-primary" style="padding: 20px;" name="Continue" type="submit">
    <span>Continue</span>
    <i class="icon-ok" style="font-size:30px; vertical-align: middle;"></i>
</button>

Producing: http://jsfiddle.net/fPXFY/5/ the output of which is:

Alternativly if your using bootstrap then you can just add align-middle to vertical align the element.

<button id="whaever" class="btn btn-large btn-primary" style="padding: 20px;" name="Continue" type="submit">Continue
    <i class="icon-ok align-middle" style="font-size:40px;"></i>
</button>

Just wrap the button label in an extra span and add class="align-middle" to both (the icon and the label). This will center your icon with text vertical.

<button id="edit-listing-form-house_Continue" 
    class="btn btn-large btn-primary"
    style=""
    value=""
    name="Continue"
    type="submit">
<span class="align-middle">Continue</span>
<i class="icon-ok align-middle" style="font-size:40px;"></i>

Bootstrap 4.3.1 just add class d-inline-flex align-items-center in your element parent, you also can use my-0 to remove excess margin in font-awesome icon, like this:

<a href="" class="btn btn-success d-inline-flex align-items-center"><i class="fab fa-whatsapp h1 my-0 pr-2"></i>Whatsapp</a>