title: Elements break line when sum of widths equal 100%
body: <p>I'm trying put a <code>input</code> and a <code>button</code> display inline, where <code>input</code> need fill 70% of row, and <code>button</code> 30%</p>
  
  <p>So, I set css 70% and 30% to elements, but elements will break line</p>
  
  <p>How to can I fix this problem?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>* {
    margin: 0px;
  }
  
  input {
    width: 70%;
  }
  
  button {
    width: 30%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div&gt;
    &lt;input type="text" /&gt;
    &lt;button&gt;Button&lt;/button&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>