add top space between rows
如何使用twitter引导框架将margin top添加到class="row"元素？
Editing or overriding the row in Twitter bootstrap is a bad idea, because this is a core part of the page scaffolding and you will need rows without a top margin.
To solve this, instead create a new class "top-buffer" that adds the standard margin that you need.
.top-buffer { margin-top:20px; }
And then use it on the row divs where you need a top margin.
<div class="row top-buffer"> ...
Ok just to let you know what's happened then, i fixed using some new classes as Acyra says above:
.top5 { margin-top:5px; }
.top7 { margin-top:7px; }
.top10 { margin-top:10px; }
.top15 { margin-top:15px; }
.top17 { margin-top:17px; }
.top30 { margin-top:30px; }
whenever i want i do <div class="row top7"></div>
for better responsive you can add margin-top:7% instead of 5px for example :D
Sometimes margin-top can causes design problems:
http://www.w3.org/TR/CSS2/box.html#collapsing-margins
So, i recommend create "margin-bottom classes" instead of "margin-top classes" and apply them to the previous item.
If you are using Bootstrap importing LESS Bootstrap files try to define the margin-bottom classes with proportional Bootstrap Theme spaces:
.margin-bottom-xs {margin-bottom: ceil(@line-height-computed / 4);}
.margin-bottom-sm {margin-bottom: ceil(@line-height-computed / 2);}
.margin-bottom-md {margin-bottom: @line-height-computed;}
.margin-bottom-lg {margin-bottom: ceil(@line-height-computed * 2);}
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