Units
MDN ⟩ CSS ⟩ length
key points
0 can only be used for length values and percentages, it can’t be used for angular values, such as degrees or time-based values like seconds.
Properties that support unitless values include line-height, z-index, and font-weight (700 is equivalent to bold; 400 is equivalent to normal, and so on).
units
absolute
relative
percentage
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