JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="div content">

  
    <div class="categories">
            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>
            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

            <div class="categories_item">
                <a href=""class="">
                    <span>Item</span>
                </a>
            </div>

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

CSS

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

.container {
  float: left;
  width: 100%;
  background-color:red;
}

.content {
  width: 94%;
  margin: 0px auto;
  background-color:yellow;
  padding:30px;
}

.categories{
  display: flex;
  justify-content: space-between;
  background-color: blue;
}

.categories_item a{
  color: green;
}

.categories_item{
  flex-grow: 1;
}