gitlab-org--gitlab-foss/app/assets/stylesheets/pages/members.scss

.project-members-new {
  > h5 {
    font-weight: normal;
  }
}

.member {
  .list-item-name {
    float: none;

    @media (min-width: $screen-md-min) {
      float: left;
      width: 50%;
    }
  }

  .controls {
    display: flex;
    width: 400px;
  }

  .form-horizontal {
    display: flex;
    flex: 1;
    margin-top: 3px;
  }

  .member-form-control {
    width: 50%;
  }
}