Media queries are used to associate a style sheet or style rule with a specific device or list of device features<span> .This technique is used for delivering a tailored style sheet to different devices and applying </span><span>CSS styles depending on a device's general type, specific characteristics or environment.
</span>
I'd suggest he uses
LOOKUP Function.
You can use the LOOKUP function when you need to look in a
single column or row and find a value from the same position in a corresponding
column or row. We have a much improved VLOOKUP that can also be used to search
one row or column or multiple rows and columns.
I believe the answer is annual maintenance
Hope this helps :p