JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
  <input type="text" id="firstrow_textbox" />
  <input type="text" id="secondrow_textbox" />
  <input type="button" id="secondrow_button" />
</div>

CSS

input { border: 1px #000 solid;margin: 0; padding: 0; }

#wrapper {
    width: 70%;
}
  #firstrow_textbox { width: 100%; }
  #secondrow_textbox { width: 70%; }
  #secondrow_button { width: 28%; }