Trapeze shadow with CSS3 - css

Question

I am wondering, is there a way to create shadow linke on the images below (possibly using pseudo class?)
The red bit behind grey box meant to be shadow with trapeze shape and no blur.
Now idea if its possible?
Thank you for your help in advance.

Answer 1

DEMO 1:
HTML:
<figure></figure>
CSS:
figure{
width:150px;
height:150px;
margin:50px auto;
background:#ccc;
position:relative;
box-shadow: 0 14px 0 -10px red;
}
figure:before, figure:after{
content:'';
position:absolute;
top: 2px;
width:0;
height:0;
}
figure:before{
left: -5px;
border-left: 5px solid transparent;
border-right: 0px solid transparent;
border-top: 77px solid red;
}
figure:after{
right: -5px;
border-left: 0px solid transparent;
border-right: 5px solid transparent;
border-top: 77px solid red;
}
DEMO 2
figure{
width:150px;
height:150px;
margin:50px auto;
background:#ccc;
position:relative;
box-shadow: 0 12px 0 -10px red;
}
figure:before{
content:'';
position:absolute;
top: -10px;
left: 0;
width:100%;
height:100%;
background:red;
z-index: -1;
-webkit-transform-style: preserve-3d;
-webkit-transform: perspective(800) rotateX(-40deg);
}

Answer 2

Just in case of using CSS3 features, you could create a trapeze by applying a transform on a pseudo-element and position that behind the box as follows:
EXAMPLE HERE
.box {
width: 200px; /* Optional */
/* height: 150px; */ /* Optional */
position: relative;
}
.box:before {
content: "";
position: absolute;
background-color: lightgray;
top: -3%; bottom: -12%; left: 0; right: 0;
transform: perspective(50em) rotateX(-30deg);
z-index: -1;
}
Therefore dimensions of the shadow box would be relative to the box. However it is not supported in IE 9 and below.