html - CSS Grid Systems: Purpose of positive padding simultaneously with negative margin? -


grid systems use code (or similar) snippet: 

.container {     padding-right: 15px;     padding-left: 15px;     margin-right: auto;     margin-left: auto;     max-width: 1170px; }  .row {     margin-left: -15px;     margin-right: -15px; }

setting left-, right-padding can understand. prevents content touching viewport-edges when viewport becomes smaller.

but in next becomes practically removed applying negative margin child-element (.row).

that doesn't make sense me.

what's purpose of pattern?


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