# Pixels and Percentages
On the TAP configuration page, you'll notice certain fields offer the option to select either 'px' or '%' units.
'px' signifies Pixels, representing a fixed unit such as 400px. This implies the element will consistently display as 400px on the output screen.
On the other hand, '%' indicates a percentage of the screen. For instance, 100% width means the element will occupy the entire available width. This unit is fluid, adjusting with the output screen.
Depending on the element and its placement, you can utilize either or both of these units for your blocks.
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