#filter {
    position: relative;
    background-color:green;
    height: 25px;
    width: 300px;
    text-align: center;
    margin: 55px auto;
    box-shadow: 0 4px 4px #000;
    padding: 10px;
}

#filter:before, #filter:after {
    height: 0;
    width: 30px;
    position: absolute;
    content: "";
    top: 4px;    
}

#filter:before{
    left: -70px;
    box-shadow: 5px 4px 4px rgba(0, 0, 0);
    
    border-top: 22px solid green;
    border-bottom: 22px solid green;
    border-left: 22px solid transparent;
    border-right: 22px solid green;
}

#filter:after{
    right: -70px;
    box-shadow: -5px 4px 4px rgba(0, 0, 0);
    border-top: 22px solid green;
    border-bottom: 22px solid green;
    border-left: 22px solid green;
    border-right: 22px solid transparent;
}