Just add the following rules to the parent element:

    display: flex;
    justify-content: center; /* align horizontal */
    align-items: center; /* align vertical */


Here&#39;s a **[sample demo][1]** (Resize window to see the image align)


[Browser support][2] for Flexbox nowadays is quite good.

For cross-browser compatibility for `display: flex` and `align-items`, you can add the older flexbox syntax as well:

    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;


  [1]: http://jsfiddle.net/danield770/vc4cd02a/
  [2]: http://caniuse.com/#feat=flexbox

Without explicitly defining the `height` I determined I need to apply the `flex` value to the parent *and* grandparent `div` elements...

    &lt;div style=&quot;display: flex;&quot;&gt;
    &lt;div style=&quot;display: flex;&quot;&gt;
     &lt;img alt=&quot;No, he&#39;ll be an engineer.&quot; src=&quot;theknack.png&quot; style=&quot;margin: auto;&quot; /&gt;
    &lt;/div&gt;
    &lt;/div&gt;

----------

If you&#39;re using a single element (e.g. dead-centered text in a single `flex` element) use the following:

    align-items: center;
    display: flex;
    justify-content: center;

Just finised work on my `other` branch. Now I need to test that this works on Heroku before I merge with the `master` branch.

Is it possible to push the `other` branch to Heroku and it replace the contents of my last push which was from the `master` branch?

Push different branch to Heroku

I have a pandas dataframe with about 20 columns.

It is possible to replace all occurrences of a string (here a newline) by manually writing all column names:

    df[&#39;columnname1&#39;] = df[&#39;columnname1&#39;].str.replace(&quot;\n&quot;,&quot;&lt;br&gt;&quot;)
    df[&#39;columnname2&#39;] = df[&#39;columnname2&#39;].str.replace(&quot;\n&quot;,&quot;&lt;br&gt;&quot;)
    df[&#39;columnname3&#39;] = df[&#39;columnname3&#39;].str.replace(&quot;\n&quot;,&quot;&lt;br&gt;&quot;)
    ...
    df[&#39;columnname20&#39;] = df[&#39;columnname20&#39;].str.replace(&quot;\n&quot;,&quot;&lt;br&gt;&quot;)

This unfortunately does not work:

    df = df.replace(&quot;\n&quot;,&quot;&lt;br&gt;&quot;)



Is there any other, more elegant solution?

Replace all occurrences of a string in a pandas dataframe (Python)

With **only** the parent `div` and the child `img` elements as demonstrated below how do I vertically *and* horizontally center the `img` element while **explicitly not** defining the `height` of the parent `div`?

    &lt;div class=&quot;do_not_define_height&quot;&gt;
     &lt;img alt=&quot;No, he&#39;ll be an engineer.&quot; src=&quot;theknack.png&quot; /&gt;
    &lt;/div&gt;

I&#39;m not too familiar with flexbox so I&#39;m okay if flexbox itself fills up the full height, but not any other unrelated properties.

CSS flexbox vertically/horizontally center image WITHOUT explicitely defining parent height

With only the parent <code>div</code> and the child <code>img</code> elements as demonstrated below how do I vertically and horizontally center the <code>img</code> element while explicitly not defining the <code>height</code> of the parent <code>div</code>?
<pre><code class="hljs language-ini">&#x3C;div class="do_not_define_height">
 &#x3C;img alt="No, he'll be an engineer." src="theknack.png" />
&#x3C;/div>
</code></pre>
I'm not too familiar with flexbox so I'm okay if flexbox itself fills up the full height, but not any other unrelated properties.

I have the following element:

    &lt;div class=&quot;modal&quot; tabindex=&quot;-1&quot; role=&quot;dialog&quot; aria-labelledby=&quot;myModalLabel&quot; aria-hidden=&quot;true&quot;&gt; 
        &lt;div class=&quot;modal-dialog&quot; style=&quot;overflow-y: scroll; max-height:85%;  margin-top: 50px; margin-bottom:50px;&quot; &gt; 
            &lt;div class=&quot;modal-content&quot;&gt; 
                &lt;div class=&quot;modal-header&quot;&gt; 
                    &lt;h3 class=&quot;modal-title&quot;&gt;&lt;/h3&gt; 
                &lt;/div&gt; 
                &lt;div class=&quot;modal-body&quot;&gt;&lt;/div&gt; 
                &lt;div class=&quot;modal-footer&quot;&gt;&lt;/div&gt; 
            &lt;/div&gt; 
        &lt;/div&gt; 
    &lt;/div&gt; 

It shows modal dialog something like this, basically, it puts scroll bar around entire `modal-dialog` and not `modal-body` that contains the content I am trying to display.

The image looks something like this:

[![enter image description here][1]][1]


How do I get a scroll bar around `modal-body` only?

I have tried assigning `style=&quot;overflow-y: scroll; max-height:85%;  margin-top: 50px; margin-bottom:50px;&quot;` to `modal-body` but it didn&#39;t work.


  [1]: https://i.stack.imgur.com/M41N2.png

How to put scroll bar only for modal-body?

I am trying to style my buttons in a way that the hover makes the button a lighter shade instead of a darker shade. I tried bootstrap customization page(http://getbootstrap.com/customize/) and it doesn&#39;t give me an option to change the button hover color. I tried doing this manually by inspecting the CSS but it is unclear how the buttons are getting the hover color. I tried another bootstrap customization website

http://pikock.github.io/bootstrap-magic/app/#!/editor


I wanted the main color to be #0495c9 and the hover color to be #00b3db but I am only able to specify the button bg color and not it&#39;s hover color.

Any help will be appreciated

Change hover color on a button with Bootstrap customization

I recently refactored some of my CSS and was pleasantly surprised to find an easier way to horizontally align my absolutely positioned element:

    .prompt-panel {
        left: 50%;
        transform: translateX(-50%);
    }

This works great! Even if my element&#39;s width is auto. However, I do not understand what&#39;s going on to make this actually work. My assumption was that translateX was just a modern, more performant means of moving an element around, but that does not appear to be the case.

Shouldn&#39;t these two values cancel each other out? Furthermore, why does

    .prompt-panel {
        left: -50%;
        transform: translateX(50%);
    }

not show the same result as the first code snippet?

Why does &quot;left: 50%, transform: translateX(-50%)&quot; horizontally center an element?

I have a problem with drop-down buttons inside tables when are responsive and scroll active because the drop-down is not visible because of `overflow: auto;` property. How can I fix that in order to show drop-down option of button when this is collapsed? I can use some jQuery but after I have problems with scroll left-right so I decided to find another solution.
I have attached a photo to understand better.![enter image description here][1]


**[Here is a small js fiddle:][2]**


  [1]: http://i.stack.imgur.com/Ibu5y.png
  [2]: http://jsfiddle.net/D2RLR/6917/

Bootstrap button drop-down inside responsive table not visible because of scroll

Is it possible to apply a style in the inner &quot;up arrow&quot; and &quot;down arrow&quot; of a `&lt;input type=&quot;number&quot;&gt;` in CSS? I would like to change the background of the up arrow to blue and the down arrow to red. Any ideas?

![styling inner arrows][1]


  [1]: http://i.stack.imgur.com/BPmQu.jpg

Styling an input type=number

This is a pretty simple question, I guess, but I can&#39;t get 3 items in the flex container to display in 2 rows, one in the first row and the other 2 in the second row. This is the CSS for the flex container. It displays the 3 items on a single line, obviously :)

    div.intro_container {
      width: 100%;
      display: flex;
      flex-direction: row;
      flex-wrap: nowrap;
    }

If `flex-wrap` is set to `wrap`, then the 3 items are displayed in a column. I thought the wrap setting was needed to display container items on several lines. 
I&#39;ve tried this CSS for the first container item, intending to have it occupy the whole of the first row, but it didn&#39;t work

    div.intro_item_1 {
      flex-grow: 3;
    }

I&#39;ve followed [the instructions in &quot;CSS-Tricks&quot;][1] but I&#39;m really not sure which combination of commands to use. Any help would be very welcome as I&#39;m puzzled by this.


  [1]: http://css-tricks.com/snippets/css/a-guide-to-flexbox/

CSS flex, how to display one item on first line and two on the next line

Hello fellow programmers!

I&#39;ve got a simple box-layout which I would love to achieve using flexbox, but I simply can&#39;t figure it out. It should look like this image.

![enter image description here][1]

So basically a row and two columns, with the row being fixed at lets say 100px in height, but all in one container. My code so far is:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    #productShowcaseContainer {
      display: inline-flex;
      flex-flow: row wrap;
      height: 600px;
      width: 580px;
      background-color: rgb(240, 240, 240);
    }

    #productShowcaseTitle {
      display: inline-block;
      height: 100px;
      width: 100%;
      background-color: rgb(200, 200, 200);
    }

    #productShowcaseDetail {
      flex: 3;
      background-color: red;
    }

    #productShowcaseThumbnailContainer {
      flex: 2;
      background-color: blue;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div id=&quot;productShowcaseContainer&quot;&gt;
      &lt;div id=&quot;productShowcaseTitle&quot;&gt;&lt;/div&gt;
      &lt;div id=&quot;productShowcaseDetail&quot;&gt;&lt;/div&gt;
      &lt;div id=&quot;productShowcaseThumbnailContainer&quot;&gt;&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;

I know this can be achieved in many ways, but I would really prefer to use CSS Flex.


  [1]: http://i.stack.imgur.com/2nMjz.png

CSS Flex Box Layout: full-width row and columns

I am trying to vertically align elements within an ID wrapper. I gave the property `display:inline-flex;` to this ID as the ID wrapper is the flex container.

But there is no difference in presentation. I expected that everything in the wrapper ID would be displayed `inline`. Why isn&#39;t it?

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    #wrapper {
        display: inline-flex;
        /*no difference to display:flex; */
    }


&lt;!-- language: lang-html --&gt;

    &lt;body&gt;
        &lt;div id=&quot;wrapper&quot;&gt;
            &lt;header&gt;header&lt;/header&gt;
            &lt;nav&gt;nav&lt;/nav&gt;
            &lt;aside&gt;aside&lt;/aside&gt;
            &lt;main&gt;main&lt;/main&gt;
            &lt;footer&gt;footer&lt;/footer&gt;
        &lt;/div&gt;
    &lt;/body&gt;

&lt;!-- end snippet --&gt;

What&#39;s the difference between display:inline-flex and display:flex?

What is the difference between `align-items` and `align-content`?




What&#39;s the difference between align-content and align-items?

I have two elements inside a container, which are being side-by-side by using flex box. On the second element (`.flexbox-2`), I am setting it&#39;s height in the CSS. However, then the first element (`.flexbox-1`) will match the height of `.flexbox-2`. How would I stop `.flexbox-1` from matching the height of `.flexbox-2`, and instead just retain its natural height? 

Here is what I have so far (also available [as a jsFiddle][1])

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    .container {
      display: -webkit-flex;
      -webkit-flex-direction: row;
    }
    .flexbox-1 {
      -webkit-flex: 1;
      border: solid 3px red;
    }
    .flexbox-2 {
      -webkit-flex: 2;
      border: solid 3px blue;
      height: 200px;
      margin-left: 10px;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;container&quot;&gt;
      &lt;div class=&quot;flexbox-1&quot;&gt;.flexbox-1&lt;/div&gt;
      &lt;div class=&quot;flexbox-2&quot;&gt;.flexbox-2&lt;/div&gt;
    &lt;/div&gt;



&lt;!-- end snippet --&gt;


  [1]: http://jsfiddle.net/5yb73cn9/

Content Type	Original Author	Original Content on Stackoverflow
Question	John	View Question on Stackoverflow
Solution 1 - Css	Danield	View Answer on Stackoverflow
Solution 2 - Css	John	View Answer on Stackoverflow

CSS flexbox vertically/horizontally center image WITHOUT explicitely defining parent height

Css Problem Overview

Css Solutions

Solution 1 - Css

Solution 2 - Css

Replace all occurrences of a string in a pandas dataframe (Python)

Push different branch to Heroku

Attributions