JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="container py-5">
  <div class="row">
    <div class="col">
      <ul class="list-group forum">
        <li class="list-group-item bg-custom-light2 py-4">
          <div class="row">
            <form class="col-5">
              <div class="form-group">
                <div class="input-group">
                  <div class="input-group-prepend">
                    <span class="input-group-text search-icon"><i class="fa fa-search"></i></span>
                  </div>
                  <input type="email" class="form-control search-input" id="exampleInputEmail1"
                         aria-describedby="emailHelp" placeholder="Search">
                </div>
              </div>
            </form>
          <div class="col-7 text-right">
            <div class="dropdown filters">
              <a class="dropdown-toggle"  id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                Filter 1
              </a>
              <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
                <a class="dropdown-item" href="#">item1</a>
              </div>
            </div>
            <div class="dropdown filters">
              <a class="dropdown-toggle" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              Filter 2
              </a>
              <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
                <a class="dropdown-item" href="#">item1</a>
              </div>
            </div>
          </div>
        </div>
        </li>
        <li class="list-group-item">list item 1</li>
        <li class="list-group-item">list item 2</li>

        <li class="list-group-item bg-custom-light2 py-4">container...

CSS

.bg-custom-light2{
  background-color: #fafafa;
}

.input-group-text{
  color:gray;
}

.filters{
  display: inline-block;
}

.search-icon{
  background-color: #ffffff !important;
  border: 1px solid #ced4da !important;
  border-right: 1px solid transparent !important;
}

.search-input{
  border-left: 1px solid transparent !important;  
}