JSFiddle - React, Tailwind, and code Playground

HTML

<div class="textbox">
	<div class="samelineDiv">
		<div id="first_name-wrapper" class="form-item">
			<input type="text" class="form-text" value="First Name" size="14" id="first_name" name="first_name" maxlength="128">
		</div>
	</div>
</div>
<div class="textbox">
	<div id="last_name-wrapper" class="form-item">
		<input type="text" class="form-text" value="Last Name" size="14" id="last_name" name="last_name" maxlength="128">
	</div>
</div>

CSS

.samelineDiv{
    float:left;
}