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Proper way to create alert box in Markdown

Sometimes, especially when writing documentation, you might want to put text in a nice colored box. To highlight info, notes, warnings, alerts etc. Like this:

Markdown colored alert box

The problem here is that there no such tag in markdown. So your only option is to use html or macros. As markdown is not processed inside html tags and following code:

<div class="note">       
    **NOTE**: Source [here](//

Will look like this:

Markdown warning

So you either need to make all text inside warning box html (which is ugly and inconsistent) or look for a better solution.

Fortunatelly, CSS goes to rescue with element+element selector that allows to style next element. Put <div class="note"></div> before the paragraph that needs to be in a warning box. Following markdown:

<div class="note"></div>       
**NOTE**: Source [here](//   

Will look as required:

Markdown colored info box

Of couse you will also need to add some css:

.note+p { /*next paragraph after <div class="note"></div>*/
    padding: 8px 35px 8px 14px;
    margin-bottom: 20px;
    text-shadow: 0 1px 0 rgba(255,255,255,0.5);
    border-radius: 4px;
    color: #3a87ad;
    background-color: #d9edf7;
    border-color: #bce8f1;

.note+p:before { /*aditionally prepend `⚠ Note:` to message: */ 
    content: "⚠ Note:";
    font-weight: bold;
    display: block;

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