html - Link to id element with offset -

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i have fixed title div on top height 80px. have link "how" pointing div. 

<div id="how">   <!-- description here --> </div>

however, when click link, because header div out of flow, covers top portion of #how div. how can set offset when click link, brings me down #div link offset of 80px?

unless willing add anchor somewhere (which not first choice), need use js. window.scrollto() place start.


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