Changing Background color of checkbox for alarm status table

I'm customizing the Alarm Status Table in Ignition Perspective and need the checkboxes to match this Figma style:

  • Size: 20x20px
  • Border radius: 6px
  • Background: #FFFFFF
  • Border: 1px solid #D0D5DD

I added this CSS:

css

.ia_checkbox__checkedIcon,
.ia_checkbox__uncheckedIcon,
.ia_checkbox__indeterminateIcon {
  background-color: #FFFFFF;
  border-radius: 6px;
}

But it's not applying correctly (overflowing from the box)—styles seem overridden or ignored. I only want to target checkboxes within the Alarm Status Table without affecting others. How can I do this properly?

NOTE: only want the changes for alarm table checkbox.

required design for checkbox