bootstrap 4 layout in angular 7

I'm trying to create a template with bootstrap grid system like the image below from medium screen sizes but unable to do so. Below is my code:

HTML:

<div class="container-fluid" style="text-align:center">
    <div class="row" style="text-align:center">
      <div class="col-md-12" style="font-size:22px">All Blogs </div>
      <br><br><br><br>
    </div>
    <br>
    <br>
    <div class="row col-md-12 py-3" *ngIf="allBlogs.length>0">
     <!--  Card Start -->
      <div class="card" *ngFor="let blog of allBlogs">
        <div class="row">
              <div class="col-md-3">
                <a [routerLink]="['/blog', blog.id]"><img src="http://localhost:4000/{{blog.imagePath}}" class="card-img-top card-img-size" alt="blog1"></a>
               </div>
          <div class="col-md-5 px-3">
            <div class="card-block px-6">
              <h4 class="card-title">{{blog.title}}</h4>
              <p class="card-text">{{blog.description}}</p>
              <br>
              <a href="#" class="mt-auto btn btn-primary">Read More</a>
            </div>
          </div>
        </div>
      </div>
    <br>
      <app-blog-category></app-blog-category>
  </div>
</div>