create this shape using css3 and html

Question

This is demo image how to create this button in css3. please help me anyone.

Answer 1

Funny exercise, something like this?

div {
    height: 40px;
    width: 20px;
    border-radius: 8px;
    background: rgb(231,76,60);
    position: relative;
}
div:before {
    content: '';
    height: 16px;
    width: 8px;
    border-radius: 3px;
    background: rgb(221,221,221);
    display: block;
    position: absolute;
    top: 6px;
    left: 6px;
}

<div></div>