Custom Payment Icon Template Needed

I need help with creating new custom payment icon template

This question in some form or another has popped up before but It still puzzles me.

Let me tell you what I have done sofar.

Step 1. I created a new sprite image from which to draw the icons for the static template block

payment_icons.override.tpl file

I plan to drop that into the design/themes/responsive/templates/addons/my_changes/hooks/index

location

Step 2. created the sprite image below

[attachment=14435:css_sprites.png]

and upload that file to

/design/themes/responsive/media/images

Step 3. created the CSS code

.bg-14_bancontact100x100 {
    width: 100px; height: 100px;
    background: url('css_sprites.png') -10px -10px;
}

.bg-10_idealbetalen100x100 {
width: 100px; height: 100px;
background: url(‘css_sprites.png’) -130px -10px;
}

.bg-13_tikkie100x100 {
width: 100px; height: 100px;
background: url(‘css_sprites.png’) -10px -130px;
}

.bg-12_sofort100x100 {
width: 100px; height: 100px;
background: url(‘css_sprites.png’) -130px -130px;
}

.bg-15_billink100x100 {
width: 100px; height: 100px;
background: url(‘css_sprites.png’) -250px -10px;
}

.bg-11_paypal100x100 {
width: 100px; height: 100px;
background: url(‘css_sprites.png’) -250px -130px;
}

and then I lost, I remember from my previous post on this topic in 2015 I need to create my own CSS classes from which I presume that piece of code goes into the payment_icons.override.tpl file.

But what is needed for that code, in other words what should the coding of this new payment_icons.override.tpl file look like?

Is it something like this

{** block-description:tmpl_payment_icons **}
{hook name="index:payment_icons"}            
{/hook}

But then I am lost,

css_sprites.png

Your code in the file should be