CSS Square Div with an Inward Oval Shape

Question

I am trying to create a div in css with an inward oval shape to it like this.

At the moment, I have a shape that is outward instead of inward (JS Fiddle Link).

.shape {
float: left;
width: 100px;
height: 50px;
border: none;
background: #CC0000;
border-radius: 0 90px 0 0;
-moz-border-radius: 0 90px 0 0;
-webkit-border-radius: 0 90px 0 0;
background-image: -webkit-gradient( linear, left top, right bottom, color-stop(0, #520C0C), color-stop(1, #CC0000) );
background-image: -o-linear-gradient(right bottom, #520C0C 0%, #CC0000 100%);
background-image: -moz-linear-gradient(right bottom, #520C0C 0%, #CC0000 100%);
background-image: -webkit-linear-gradient(right bottom, #520C0C 0%, #CC0000 100%);
background-image: -ms-linear-gradient(right bottom, #520C0C 0%, #CC0000 100%);
background-image: linear-gradient(to right bottom, #520C0C 0%, #CC0000 100%);
}

Any ideas on how to go about this?

Answer 1

Have a look at my example fiddle.

I used a pseudo-element and some elliptical border-radius coupled with an inset box-shadow.

div {
    position:relative;
    width: 200px;height: 100px;
    background: #CC0000;
    background-image: linear-gradient(to right bottom, #520C0C 0%, #CC0000 100%);
}
div:after {
    position:absolute;content:"";
    width: 100%;height: 95%;
    background: #222;
    box-shadow:inset 10px -10px 5px -10px #000;
    border-radius: 0 0 0 200px / 100px;
}

With a little more effort, one could probably get closer to your result, but this might be a good starting point.