引导4中多行居中的导航栏项目

我有一个导航栏,当只有单行项目时,它可以正常工作:

<div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav ml-auto">

                <li class="nav-item">
                    <a class="nav-link" href="#">FAQ</a>
                </li>

                <li class="nav-item">
                    <a class="nav-link profile" href="#">
                        <div class="profile-info">
                            <span class="name">Артём</span>
                        </div>
                    </a>
                </li>
            </ul>
        </div>

但当项目为多行时,其他项目将失去中心垂直对齐,而改为顶端对齐:

<div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav ml-auto">

                <li class="nav-item">
                    <a class="nav-link" href="#">FAQ</a>
                </li>

                <li class="nav-item">
                    <a class="nav-link profile" href="#">
                        <div class="profile-info">
                            <span class="name">Артём</span>
                            <span class="balance">31337 ₽</span>
                        </div>
                    </a>
                </li>
            </ul>
        </div>

我的SASS代码:

#site-header {
  background: #2d3840;
  border-bottom: solid 1px #20272d;
  height: 83px;

  .navbar-brand {
    color: white;
  }

  .nav-item {

    &:not(:first-child) {
      margin-left: 25px;
    }

    &:not(:last-child) {
      margin-right: 25px;
    }

    // General link
    a.nav-link {
      color: white;
      font-size: 16px;
      text-align: center;

      @include transition(0.5s);
      &:hover {
        @include transition(0.3s);
        color: $color-accent;
      }

      &.active {
        padding: 6px 21px 6px 21px;
        background: $color-accent;
        border-radius: 17.5px;
        box-shadow: 0 2px 10px 0 rgba(90, 175, 238, 0.6);

        &:hover {
          color: white;
          box-shadow: none;
        }
      }

      // Profile
      &.profile {
        .profile-info {
          display: inline-block;

          .name {
            display: block;
            font-weight: bold;
          }

          .balance {
            display: block;
            font-size: 16px;
            font-weight: bold;
            color: $color-accent;
          }
        }
      }
    }

  }
}

渴望的:

那么,当存在多行项目时,如何将项目居中?