Making text transparent affect background color - html

Question

Okay so i want to make a transparent button with some icon / text inside that, on hover, makes the text transparent and the background colored. This is "kinda" my code:
.button-color {
padding: 12px 20px;
border: none;
color: red;
background-color: transparent;
}
.button-color:hover {
color: transparent;
background-color: red;
}
<button class="button-color">Hi!</button>
(The code is way longer but you get the point)
And this is the result:
Unhovered:
Hovered:
I want the background to get transparent where the icon is. Oh and setting the icon to a certain color won't do the trick because these buttons are inside a 3D viewer that has a model loaded . I don't even know if this is achievable with pure css but who knows.

Answer 1

You can get this effect using blend-mode : hard-light as long as the color of the element has RGB values that are 0 or 255. (that is, primary colors).
With this blend-mode, gray (RGB values of 128) is "transparent"
.button-color {
padding: 12px 20px;
border: none;
font-size: 100px;
color: red;
background-color: gray;
mix-blend-mode: hard-light;
left: 10px;
top: 10px;
width: 200px;
}
.button-color:hover {
color: gray;
background-color: red;
}
.container {
background-color: lightgreen;
width: 200px;
}
<div class="container">
<button class="button-color">Hi!</button>
</div>