css - How to change last child with inline style -


so have element want send via email, style has defined inline. style applied array of element. need last element different style there way it? 

<div class='label' style=' margin-bottom: 5px; min-height: .75em; width: 8em;  font-weight:bold;  font-size:1.2em; color:#333; display: inline-block;'>$key:    </div>

i assume using javascript said elements in array. here how can access last element , apply style it:

var last = arrayname.length -1; arrayname[last].style.cssproperty = 'value';

where have replace arrayname array, cssproperty property want change , value value of property. example,

arrayname[last].style.color='red';

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