how to make angular material component appear on top the navbar?

enter image description here

As you can see in the picture above my search component(which is an autofill component from displays its options after the navbar(green) ends, I want my options to display right under the search box, on top the green navbar.

this is my bootstrap navbar

<nav class="navbar navbar-expand-lg navbar-light bg-light mynavbar">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
  <span class="navbar-toggler-icon"></span>

<div class="collapse navbar-collapse" id="navbarSupportedContent">
  <ul class="navbar-nav mr-auto">
    <li class="nav-item active">
      <a class="nav-link nav-link-r" href="#">Home <span class="sr-only">(current)</span></a>
    <li class="nav-item">
      <a class="nav-link nav-link-r" href="#">Link</a>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle nav-link-r" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      <div class="dropdown-menu" aria-labelledby="navbarDropdown">
        <a class="dropdown-item" href="#">Action</a>
        <a class="dropdown-item" href="#">Another action</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Something else here</a>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Disabled</a>

and this is my searchbar component,

<form class="example-form">
      <input type="text"
             placeholder="Pick one"
             style="border-style: none; height:100%; width:100%;"
      <mat-autocomplete #auto="matAutocomplete">
        <mat-option *ngFor="let option of filteredOptions | async" [value]="option">

what’s causing the options to appear after the navbar? how do I correct it?

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