<section class="my-5">
   <div class="row ">
    <div class="col-4 bg-dark left-side">
      <h3>Left Side</h3>
    </div>

    <div class="col-8 bg-theme right-side">
      <h3>Right Side</h3>
    </div>

  </div><!-- close row -->
</section>

<section class="">
   <div class="row ">
    <div class="col-12">
     <img class="img-fluid w-100" src="https://i.postimg.cc/pLYVLQv2/angle-div.png">
    </div>
  </div><!-- close row -->
</section>

.bg-dark{
	background-color: #222222;
  color: #fff;
}
.bg-theme{
	background-color:#c92429;
	color: #fff;
}