Ideas/resources/views/shared/search-bar.blade.php

<div class="card">
    <form action="{{route('ideas.index')}}" method="get">
    <div class="card-header pb-0 border-0">
        <h5 class="">Search</h5>
    </div>
    <div class="card-body">
        <input name="search" placeholder="..." class="form-control w-100" type="text" id="search" value="{{request('search', '')}}">
        <button class="btn btn-dark mt-2"> Search</button>
    </div>
    </form>
</div>