Why blueprint framework defines margin-bottom on headers and text sizes?

为什么蓝图框架定义边距对标题和文字的大小？

youdao

When people talk about the bottom line, they generally mean net profit margin — the money the company earns after paying all its expenses, interest, and taxes.

当人们谈论账本底线的时候，他们的意思通常是净利润率——扣除所有费用、利息和税金之后公司所赚的钱。

youdao

Notice how the top margin of the second paragraph is extended vertically to meet the bottom margin of the previous paragraph.

请注意第二个段落的上边框是如何垂直扩展以便与前一段落的底边框相接的。

youdao

Not exactly--Nortel was looking at shedding the low-margin bottom of its optical-components business, saving the jazziest lines for itself.

FORBES: Lighting up Nortel

Should bonuses come off the top-line, bottom-line, be based on contribution margin, be subjectively or objectively distributed, be paid in cash, stock, options, profit sharing, perks, or some other mechanism?

FORBES: The Year End Bonus - Do You Or Don't You?

None is a true bottom-line margin that relates profits to sales after deducting all costs, including the opportunity cost of equity capital.

FORBES: Are You Being Misled By Profit Margins?