<div class="container-fluid">
  <div class="row">
    <div class="col-md-3"></div>
    <div class="col-md-9 loginbg">
    </div>
  </div>
</div>

.loginbg {
  background: url(https://picsum.photos/id/1050/1200/1200) no-repeat center top;
  background-size: cover;
  min-height: 100vh;
  background-position: 100%;
}