how to create inline style with :before and :after

I generated a bubble chat thingy from http://www.ilikepixels.co.uk/drop/bubbler/

In my page I put a number inside of it

.bubble {
  position: relative;
  width: 20px;
  height: 15px;
  padding: 0;
  background: #FFF;
  border: 1px solid #000;
  border-radius: 5px;
}

.bubble:after {
  content: "";
  position: absolute;
  top: 4px;
  left: -4px;
  border-style: solid;
  border-width: 3px 4px 3px 0;
  border-color: transparent #FFF;
   display: block;
  width: 0;
  z-index: 1;
}

.bubble:before {
  content: "";
  position: absolute;
  top: 4px;
  left: -5px;
  border-style: solid;
  border-width: 3px 4px 3px 0;
  border-color: transparent #000;
  display: block;
  width: 0;
  z-index: 0;
}

I want the background-color of the bubble to change according to the number inside of it via rgb

so if my div is

<div class="bubble" style="background-color: rgb(100,255,255);"> 100 </div>

I want the color to be rgb(100,255,255)

The thing is this doesn't affect the triangle.

How do I write the inline css so it will include the :before and :after?

Solution 1:

You can, using CSS variables (more precisely called CSS custom properties).

Set your variable in your style attribute:
style="--my-color-var: orange;"
Use the variable in your stylesheet:
background-color: var(--my-color-var);

Browser compatibility

Minimal example:

div {
  width: 100px;
  height: 100px;
  position: relative;
  border: 1px solid black;
}

div:after {
  background-color: var(--my-color-var);
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
}

<div style="--my-color-var: orange;"></div>

Your example:

.bubble {
  position: relative;
  width: 30px;
  height: 15px;
  padding: 0;
  background: #FFF;
  border: 1px solid #000;
  border-radius: 5px;
  text-align: center;
  background-color: var(--bubble-color);
}

.bubble:after {
  content: "";
  position: absolute;
  top: 4px;
  left: -4px;
  border-style: solid;
  border-width: 3px 4px 3px 0;
  border-color: transparent var(--bubble-color);
  display: block;
  width: 0;
  z-index: 1;
  
}

.bubble:before {
  content: "";
  position: absolute;
  top: 4px;
  left: -5px;
  border-style: solid;
  border-width: 3px 4px 3px 0;
  border-color: transparent #000;
  display: block;
  width: 0;
  z-index: 0;
}

<div class='bubble' style="--bubble-color: rgb(100,255,255);"> 100 </div>

Solution 2:

You can't. With inline styles you are targeting the element directly. You can't use other selectors there.

What you can do however is define different classes in your stylesheet that define different colours and then add the class to the element.

Solution 3:

The key is to use background-color: inherit; on the pseudo element.
See: http://jsfiddle.net/EdUmc/