Negative Border Radius in CSS?

Question

I\'m trying to do CSS to make a div that looks like this:

I\'m pretty much started with this:

.player {
    width: 480px;
    height: 80px;
    bord         


        

Answer 1

.wrapper {
    width: 500px;
    height: 103px;
    background-color: red;
    padding-top: 15px;
}

.player {
    width: 480px;
    height: 83px;
    margin-left: 10px;
    border-top-right-radius: 40px;
    border-bottom-right-radius: 40px;
    border: 1px solid black;
    border-left: none;
    background-color: blue;
    -webkit-mask-image: radial-gradient(circle at left, transparent 0, transparent 40px, black 41px);
}