Can't override bootstrap CSS

Question

I'm using the Joomla template RsKala! by RSJOOMLA.

I have successfully put CSS override code in the custom.css for these items:

.item-image.pull-left,
.item-image.pull-right {
  float: none !important;
  width: 33% !important;
}

and it works fine. However, I'm trying to override the list-style (and list-style-type too?) that changes the UL and LI tags to none.

Working in the Google Chrome web browser I'm able to do Inspect and see that UL is being references from bootstrap. If I made the change there to do this:

list-style: none !important;

or

list-style-type: none !important;

It does remove the bullet icons, which is what we want.

But if I add what I expect to work in custom.css (same place the first css code I included is working), it doesn't have any effect at all:

ul {
   list-style: none !important;
   margin-left: 0 !important;
   padding-left: 1em !important;
   text-indent: -1em !important;
}

Is the ul being loaded someplace I'm not aware of after all this?

I'm doing all this to remove the bullet icons from display for the Joomla module mod_articles_category.

I have also tried adding to custom.css:

html * {
list-style: none !important;
}

As well as:

html ul, ol, li, menu, dir {
        list-style: none !important;
        list-style-type: none !important;
}

and either has any effect.

Answer 1

Adding this to custom.css is the right CSS:

li {
    list-style: none !important;
}

However, to my surprise the web browser was caching the CSS. Even though content could be updated on the web site, and was there when it was reloaded, the CSS was not being updated. I ended up having to go clear cache from the web browser and then the newly added CSS appeared and worked.

I'm still puzzled about this, because the cache wasn't updated on reload in Google Chrome and Safari, and Safari on the iPhone. In order for the new CSS to take effect, I had to clear cache on the above web browsers.

The Cache Settings in Joomla 3.8.2 are:

Cache Handler: File
Path to Cache Folder: (blank)
Cache Time *: 15
Platform Specific Caching: No
System Cache: OFF - Caching disabled.