Changing bullet point to images

Hi,

I’m using the Responsive theme and trying to changing bullet points to images but am getting errors in the console relating to my jquery.js, for example, m. Callbacks…

No bullet points are showing at all……

Here is my HTML:

<ul class="no-bullet">
<li class="se-icon">Domestic Electrical

<li>Commercial Electrical</li>
<li>Electric Heating & Under Floor Heating Systems</li>
<li>PAT Portable Appliance Testing</li>
Here is my CSS: 

li.se-icon {
	background: url('../wp-content/themes/responsive-child/images/Bullet_icon.png');
}

ul.no-bullet {
	list-style-type: none;
	padding: 0;
	margin: 0;
}