Three dimensions card

<div class="three-dimensions-card">
...
</div>
:root {
--three-dimensions-card-left-side-width: 1rem;
}
.three-dimensions-card {
position: relative;
}
/* The left side */
.three-dimensions-card::before {
background: rgba(0, 0, 0, 0.3);
content: '';
/* Position */
top: var(--three-dimensions-card-left-side-width);
left: 0px;
position: absolute;
transform: translate(-100%, 0) skewY(-45deg);
transform-origin: left top;
/* Size */
height: 100%;
width: var(--three-dimensions-card-left-side-width);
}
/* The bottom side */
.three-dimensions-card::after {
background: rgba(0, 0, 0, 0.3);
content: '';
/* Position */
bottom: 0px;
left: 0px;
position: absolute;
transform: translate(0, 100%) skewX(-45deg);
transform-origin: left top;
/* Size */
height: var(--three-dimensions-card-left-side-width);
width: 100%;
}

See also

Card

Layered card

Stacked cards