Line Numbers Impossible To See in AdminCP Editor

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Open this css file:

admin/jscripts/codemirror/theme/mybb.css

and see at line no. 6 if it is there:

.cm-s-mybb .CodeMirror-linenumber { color: white; }

If not try adding it, if yes - append 'important'

.cm-s-mybb .CodeMirror-linenumber { color: white !important; }

If the issue still not resolved, open this css:

admin/jscripts/codemirror/lib/codemirror.css

Go to line no. 36:

.CodeMirror-linenumber {
padding: 0 3px 0 5px;
min-width: 20px;
text-align: right;
color: #999;
white-space: nowrap;
}

Change the color to 'white'.