More issues with REST API integration

I'm now having issues changing the submit (check) button to reflect, well anything that would resemble a button. I've tried changing the code itself to reflect the css style of the theme's buttons but still nothing. Please reference http://spcellfix.com/home/check-status/ and I'll copy the current code below. Mind you this is the code provided by my billing/invoicing company to be able to integrate with there REST API.

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<form accept-charset="UTF-8" action="http://spcellfix.repairshopr.com/my_profile/do_login" method="post"><div style="margin:0;padding:10px;display:inline"></div>
<h6>Let's Check On Your Device</h6>
<div class="login-fields">
<h5>Sign in using ticket number and last name:</h5>
<div class="field">
<label for="username"><span style="font-family: 'Cronos Pro Display', 'Cronos Pro Light', 'Cronos Pro Caption', 'Cronos Pro'; font-style: normal; font-size: 18px;"><span style="color: #ffffff">Ticket Number:</span></span>:</label>
<input id="ticket_number" name="ticket_number" placeholder="Ticket #" type="text" />
</div>
<!-- /field -->
<div class="field">
<label for="password" style="font-size: 18px; font-family: 'Cronos Pro Display', 'Cronos Pro Light', 'Cronos Pro Caption', 'Cronos Pro';"><span style="color: #ffffff">Last Name</span></label>
<span style="color: #FFFFFF"></span>
<input name="last_name" type="text" class="login username-field" id="last_name" placeholder="Last Name" autocomplete="off" /></br>
</div> <!-- /password -->
</div> <!-- /login-fields -->

<div class="login-actions">
<input class="request-button" name="commit" type="submit" value="Check" />
</div> <!-- .actions --></br>
</form>