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Answered Animate background-color to x transparent with Variable


Well-Known Coder
Hi everyone,

I have an HTML element (fieldset) that I would look to animate the background-color transparency, from solid to 0.75 of transparency

If there will be a way just to change the alpha channel that would be great.. but here what I've done so far.

The background color of this fieldset come from an external .css with a variable name var(--exTheColor)

The declaration of that variable in the .css file

in my html page I have tried

@keyframes TransBG {
   form {background-color: rgba(var(--exTheColor), 1);}
   to {background-color: rgba(var(--exTheColor), 0.7);}
.TBG {
   animation-name: TransBG;
   animation-duration: 1s;
   animation-timing-function: ease-out;
   animation-delay: 1.5s; 

<fieldset class="TBG" style="background-color: var(--exTheColor)"></fieldset>


The resulting animation go from full solid to full transparent :thinking: ! any idea ?
I've found ! I was needed to declare the variable not as a rgb but directly put the raw serie


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