Hi,
Found an issue when Discourse chat plugin activated the Banner of Discourse Search Banner blanks.
Running Test-passed
using Air theme. When Chat plugin disabled it displays no issues. After chat enabled as above.
EDiT: Was mistaken. Re confirmed it is actually a conflict/issue with Air theme background see blue is cut out/off. See posts below with chat off Blue background is displayed properly with Discourse search banner overlayed properly in white on blue.