body{
    margin: 0px;
    background-color: silver;
}
.banner{
    margin: 20px auto;
    width: 1000px;
    height: 150px;

    background-color: royalblue;

    border: 5px;
    border-style: dashed;
    border-color: pink;

    border: 5px dashed black;
    border-left-color: green;
    border-right-color: #fff;

    border-radius: 50px;

    border-right-style: dashed;
}