How to effectively handle submenus within a Bootstrap 4 mobile menu?

I am currently updating our website from Bootstrap 3.3.7 to Bootstrap 4. The header contains a navigation bar with dropdown items.

https://i.sstatic.net/n2P6U.png

<header>
  <nav class="navbar fixed-top navbar-expand-lg navbar-light bg-white bg-pb-header-gradient">
    <button class="navbar-toggler p-0" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent"
  aria-expanded="false" aria-label="Toggle navigation">
       <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="" routerLink="/home">
      <img src="/assets/images/pb-header-mark.svg" width="32" height="31" class="d-inline-block align-top" alt=""> Design System
    </a>

<div class="collapse navbar-collapse" id="navbarSupportedContent">
  <ul class="navbar-nav mr-auto">
    <li class="nav-item">
      <a class="nav-link" routerLink="/home">Home</a>
    </li>
    ... etc ...

As I work on making the site mobile-responsive with minimal overrides, I had to adjust the background size of the gradient to ensure the menu doesn't have a gradient background:

https://i.sstatic.net/VVTjo.png

However, the dropdown menu under "web" is still displaying as a typical dropdown:

https://i.sstatic.net/tfIw4.png

Is there a built-in override for this common header menu pattern that needs to be adapted for mobile devices?

htmlcsstwitter-bootstrapbootstrap-4

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