Stacked cards

<div class="container">
<!-- Repeat if you want to have more cards -->
<div class="container__card"></div>
<!-- Main card's content -->
...
</div>
.container {
/* Used to position the stacked cards */
position: relative;
}
.container__card {
/* Absolute position */
left: 0px;
position: absolute;
top: 0px;
/* Take full size */
height: 100%;
width: 100%;
/* Displayed under the container */
z-index: -1;
/* Background and border colors */
background-color: rgb(255, 255, 255);
border: 1px solid rgba(0, 0, 0, 0.3);
/* Rotate it. Change the number of degrees for the following cards */
transform: rotate(5deg);
}

See also

Card

Layered card

Three dimensions card