.post-content img {
   border: solid 1px #444;   
}
.wp-caption.aligncenter {
    background-color: #000;
    width: 100% !important;
    padding-top: 20px;
    margin-bottom: 1.5em;
    -webkit-box-shadow: 1px 4px 4px 1px #bbb; 
    -moz-box-shadow: 1px 4px 4px 1px #bbb;
    box-shadow: 1px 4px 4px 1px #bbb; 
}
.wp-caption.aligncenter img {
    margin: 0 auto;   
}
.gallery-item {
    background-color: #000;
    padding-top: 15px;
    padding-bottom: 15px;
    -webkit-box-shadow: 1px 4px 4px 1px #bbb; 
    -moz-box-shadow: 1px 4px 4px 1px #bbb;
    box-shadow: 1px 4px 4px 1px #bbb; 
}