html5 - How to write HTML code of main. -

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code necessary place layer "main" left edge 33.3% left edge plus 7 pixels? . im not sure how write code.

use css calc function element want position way.

left:calc(33.3% + 7px);

example

div{    width:100px;    height:100px;    position:absolute;    background:blue;    left:calc(33.3% + 7px);  }
<div></div>


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