html - Vertical centering <a> with glyphicon on Bootstrap 3 -

i'm using twitter bootstrap 3, , don't have additional css file. have following code somewhere in html page:

<div class="col-md-12">     <div class="col-md-5">         <input type="text" class="form-control" placeholder="task"/>     </div>         <div class="col-md-5">         <input type="textarea" class="form-control" placeholder="descr."/>     </div>     <a ng-click="addtask()" class="glyphicon glyphicon-plus"></a> </div> 

it looks this:

as can see, + not centered. vertical align inputs. suppose simple, have not yet found solution ...

can me finding how can vertical center <a> ?

thanks :-)

add this(change px liking)

<a ng-click="addtask()" class="glyphicon glyphicon-plus" style="margin-top:15px;"></a>