html - Div box not displaying right away down to the previous -


i made div blocks if 1 of block inside row more higher ( more data inside block ) next row blocks display not right away col-md-4 block after previous col highest block. see in picture.

how remove space between first row blocks? :)

code : 

    <div class="row"> <div class="col-md-4">box</div> <div class="col-md-4">box</div> <div class="col-md-4">box longer</div> <div class="col-md-4">box</div> <div class="col-md-4">box</div> <div class="col-md-4">box</div>   </div>


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