<div class="row"> <hr style="height: 10px; background: #000; width: 100%;" /> </div>
.almo-black-bar { height: 3px; margin: 0px; background-color: #000000; }
<div class="section"> <div class="container"> <div class="row"> <div class="col-md-8 almo-black-bar"></div> </div> </div> </div>