Icons

Hi all

I need to change the icons to something more relevant to the headings. Is there a way to do this. Site is offline at present but have provided code. I want to change the heartbeat icon. Sorry it’s super novice but I’m literally learning at the moment and I’d just like some advice really on best way to do it.

`<section id=”services-block” class=”home content-block”>
<div class=”spacer-5x visible-sm visible-xs”></div>
<div class=”col-lg-3 col-sm-6″>
<div class=”service”>
<div class=”icon”>
<span class=”nc-icon-outline health_heartbeat-16″></span>

</div>