JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <header class="Header content">
            <h1 class="title"><a href=""><i class="fa fa-chrome" aria-hidden="true"></i> logo</a> </h1>
            <ul class="main_nav">
                <li><a href="">Item 1</a></li>
                <li><a href="">Item 2 </a></li>
                <li><a href=""> Item 3</a></li>
                <li class="nopaddingright"><a href="" class="create"> Item 4</a></li>
            </ul>

    </header>
</div>

<div class="container background-light-plus">
<div class="Banner content">
    <div class="search">
        <form class="search_form">
            <div class="Banner__search_form_element">
                <i class="fa fa-search" aria-hidden="true"></i>
                <select>
                    <option selected>Option1</option>
                </select>
            </div>
            <div class="Banner__search_form_element">
                <i class="fa fa-search" aria-hidden="true"></i>
                <select>
                    <option selected>Option2</option>
                </select>
            </div>

            <div class="Banner__search_form_element">
                <i class="fa fa-search" aria-hidden="true"></i>
                <select>
                    <option selected>Option3</option>
                </select>
            </div>

            <div class="Banner__search_form_element">
                <i class="fa fa-search" aria-hidden="true"></i>
                <input class="Banner__search_form_element_search" type="submit" value="Search">
            </div>


        </form>
    </div>
    
</div>
</div>

CSS

*,
*:after,
*:before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  outline: 0;
  border-radius: 0;
}

fieldset {
  border: 0;
}




input,
select,
textarea,
button {
  padding: 15px;

  width: 100%;
}

select,
input,
button {
  border: 0;
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  color:#94a3a8;

}

img {
  width: 100%;
  max-width: 100%;
  vertical-align: middle;
  margin: 0;
}

a img {
  border: none;
  margin: 0;
}

a {
  text-decoration: none;
}

ul {
  list-style: none;
  margin:0;
  padding: 0;
}

.container {
  float: left;
  width: 100%;

}

.content {
  width: 96%;
  margin: 0px auto;
  padding: 30px;
}




.Header{
  padding: 15px;
}

.Header, .main_nav{
  display: flex;
  align-items: center;
}

.title{
  flex-grow:1;
}

.title a{
  color:red;
  font-size: 0.85em;
}

.main_nav{
  background-color:red;
}

.nopaddingright:0;

.main_nav li{
  padding: 0 15px;
}

.main_nav a{
  font-weight: 700;
  font-size: 0.85em;
  color:brown;
}

.main_nav a:hover{
  color:brown;
}

.create{
  border:2px solid red;
  padding: 10px;
  color:red !important;
  border-radius: 4px;
}

.create:hover{
  border:2px solid red;
  padding: 10px;
  color:white !important;
  background-color: red;
  border-radius: 4px;
}


/*************** BANNER *****************/

.Banner{
  background-color: gray;
  width: 100%;

}

.search{
  background-color: red;
  padding: 30px;
  border-radius: 4px;
}

.input{
  background-color: #fff;
}

.search select{
  background-color: #f8f8f8;
}

.search_form{
  display: flex;
  align-items: center;
  margin: 0;
  flex-wrap: wrap;
  font-size: 0;
}



.Banner__search_form_element{
  flex-grow: 1;
}

.Banner__search_form_element_search{
  background-color: green;
  color: white;
}