#boxshadow {
    position: relative;
    -moz-box-shadow: 1px 2px 4px rgba(0, 0, 0,0.5);
    -webkit-box-shadow: 1px 2px 4px rgba(0, 0, 0, .5);
    box-shadow: 1px 2px 4px rgba(0, 0, 0, .5);
    padding: 10px;
    
    background-color:white;
    border-bottom-width:10px
}

/* Make the image fit the box */
#boxshadow img {
    width: 100%;
    /*border: 1px solid #8a4419;*/
    /*background: white;*/
    background-color:white;
    border-style: inset;
}
#boxshadow::after {
    content: '';
    position: absolute;
    z-index: -1; /* hide shadow behind image */
    -webkit-box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3);
    box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3);                
    width: 80%; 
    left: 10%; /* one half of the remaining 20% */
    height: 100px;
    bottom: 0;
 
}