Three-Column Layout… left (fixed px), center (50%), right (50%)

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I want the left column to be 40px. I want the center column to be 50% of the remaining viewport and I want the right column to be the other 50% of the remaining viewport.It should look something like this:\[code\][LEFTCOLUMN][...CENTER COLUMN...][...RIGHT COLUMN....][...40px...][........50%........][........50%........]\[/code\]The solution presented here (link) will not work for my case as the center column can become too collapsed on mobile devices.Thanks!