title: How to divide by two any columns on CSS
body: <p>Here's a code from w3 schools.There are 9 boxes there.But I want to just divide the width of 3rd column of 1st row by two.How can i do this?Here's the code below</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>.grid-container {
    display: grid;
    grid-template-columns: auto auto auto;
    background-color: #2196F3;
    padding: 10px;
  }
  .grid-item {
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.8);
    padding: 20px;
    font-size: 30px;
    text-align: center;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;body&gt;
  
    &lt;div class="grid-container"&gt;
      &lt;div class="grid-item"&gt;1&lt;/div&gt;
      &lt;div class="grid-item"&gt;2&lt;/div&gt;
      &lt;div class="grid-item"&gt;3&lt;/div&gt;  
      &lt;div class="grid-item"&gt;4&lt;/div&gt;
      &lt;div class="grid-item"&gt;5&lt;/div&gt;
      &lt;div class="grid-item"&gt;6&lt;/div&gt;  
      &lt;div class="grid-item"&gt;7&lt;/div&gt;
      &lt;div class="grid-item"&gt;8&lt;/div&gt;
      &lt;div class="grid-item"&gt;9&lt;/div&gt;  
    &lt;/div&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>This is how it should look:
  <a href="https://i.stack.imgur.com/5Oiul.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5Oiul.jpg" alt="enter image description here"></a></p>