how to create angular div in html5 css3

I need help in creating diagonal div as shown in the picture. i have diagonal design with triangles at top right and bottom left with using absolute positioning and z-index. And this div will be the main div having content in it. I need to make a div similar to the picture. i tried using transform skew property but that does not help. Any help will be appreciable. The div will have something like this

<div class="tr-corner"><img src="tr.png"></div>
<div class="main">
<div class="content">
Blah blah blah
</div>
</div>
<div class="bl-corner"><img src="bl.png"></div>

CSS

.tr-corner{
position:absolute;
top:0;
right:0;
z-index: 1;
}
.bl-corner{
position:absolute;
bottom:0;
left:0;
z-index: 3;
}

Now i need to create the div with id "main" to be diagonal as shown below.

enter image description here

Answers:

You can use skew() to achieve that

div {
    height: 200px;
    border: 2px solid #aaa;
    background: linear-gradient(to bottom, #ffffff 0%,#e5e5e5 100%);
    transform: skew(20deg,0);
}

Demo

Make sure you add proprietary properties as well, so that old browser versions don't fail to render.

div {
    height: 200px;
    border: 2px solid #aaa;
    background: linear-gradient(to bottom, #ffffff 0%,#e5e5e5 100%);
    -webkit-transform: skew(20deg,0);
    -moz-transform: skew(20deg,0);
    transform: skew(20deg,0);
}

Demo 2 (Added proprietary properties.. especially for chrome users)

Browser compatibility is pretty sweet..

enter image description here

Credits : Mozilla Developer Network

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