3D-like hover effect on button - css

Question

I'm trying to replicate this effect with pure CSS:
So far I've tried doing:
.parent {
height: 90vh;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
}
.hoverable-element {
border: 0.1rem solid #000;
background: #fff;
padding: 1rem 2rem;
transform: translate(0, 0);
box-shadow: 0 0 0 #000;
transition:
box-shadow 200ms ease-out,
transform 200ms ease-out;
}
.hoverable-element:hover {
transform: translate(-0.5rem, -0.5rem);
box-shadow:
0.1rem 0.1rem 0 #000,
0.2rem 0.2rem 0 #000,
0.3rem 0.3rem 0 #000,
0.4rem 0.4rem 0 #000,
0.5rem 0.5rem 0 #000;
}
<div class="parent">
<button class="hoverable-element">Hoverable Button</button>
</div>
But this method repeats a lot of unnecessary code, as well as not properly doing what I intended.
I want the button "shadow" or hover-effect-thingy to be bordered with a white background (as shown in the image). Other than that I'm clueless as to where to start

Answer 1

here is an idea with pseudo element and skew transformation:
.parent {
height: 90vh;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
}
.hoverable-element {
border: 1px solid #000;
background: #fff;
padding: 1rem 2rem;
position: relative;
transition: transform 0.5s;
}
.hoverable-element::before,
.hoverable-element::after {
content: "";
position: absolute;
border: inherit;
transition: inherit;
}
.hoverable-element::before {
height: 1rem;
top: 100%;
left: -1px;
right: -1px;
transform-origin: top left;
transform: skewX(45deg) scaleY(var(--s, 0));
}
.hoverable-element::after {
width: 1rem;
left: 100%;
top: -1px;
bottom: 0;
border-bottom:none;
transform-origin: bottom left;
transform: skewY(45deg) scaleX(var(--s, 0));
}
.hoverable-element:hover {
transform: translate(-0.5rem, -0.5rem);
--s: 1;
}
<div class="parent">
<button class="hoverable-element">Hoverable Button</button>
</div>