Highlight lines in Ace (Editor)

gistfile1.coffee

###
CoffeeScript

marker = null;

require(["ace/range"], (range) ->
    marker = editor.getSession().addMarker(new range.Range(7, 0, 7, 2000), "warning", "line", true);
)

setTimeout(->
    editor.getSession().removeMarker(marker)
, 3000)

###

###
CSS

.warning
{
    background: rgba(255, 50, 50, 0.1);
    position: absolute;
    width: 100% !important;
    left: 0 !important;
}
###

position: absolute is the secret sauce here. Without that you will be left scratching your head.