Something about css:margin

margin : 1px; -> margin all = 1px;
margin : 1px 2px; -> margin top-bottom = 1px, margin left-right = 2px;
margin : 1px 2px 3px; -> margin top = 1px, margin left-right = 2px, margin bottom = 3px
margin : 1px 2px 3px 4px; You know that top-right-bottom-left

yah, that's all

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