How to get rid of the annoying Yellow triangle?

[silvertouring]

How can I get rid of the annoying Yellow triangle with exclamation mark?
I've posted a screenshot.

https://vborg.vbsupport.ru/external/2016/06/6.jpg (https://imageshack.com/i/pmsQDVj2j)

[In Omnibus]

Typically that means you have posts that are either waiting to be moderated or have been moderated.

[silvertouring]

Where can I see them?

[shimei]

In additional_css:

.vb-icon-warning-orange {
background-position: -288px -240px;
width: 16px;
height: 15px;
display: none;
}

[Replicant]

I had some of those on my forum. It was posts that had been soft deleted. After the permanent delete, the triangle disappeared.

[silvertouring]

In additional_css:

.vb-icon-warning-orange {
background-position: -288px -240px;
width: 16px;
height: 15px;
display: none;
}

where can I find additional_css?
sorry new to this.

--------------- Added 1465978764 at 1465978764 ---------------

I had some of those on my forum. It was posts that had been soft deleted. After the permanent delete, the triangle disappeared.

that's my problem as well, but I can't figure out how to permanently remove soft deleted stuff.
Any help?
Thanks