body {
    font-family: sans-serif;
}
#container {
    background: #DDD;
    max-width: 1400px;
}
.item {
    width: 200px;
    float: left;
}
.item img {
    display: block;
    width: 500px;
}
button {
    font-size: 18px;
}
.container{
    width:100%;
}
img {
  filter: gray; /* IE6-9 */
  -webkit-filter: grayscale(1); /* Google Chrome, Safari 6+ & Opera 15+ */
    -webkit-box-shadow: 0px 2px 6px 2px rgba(0,0,0,0.75);
    -moz-box-shadow: 0px 2px 6px 2px rgba(0,0,0,0.75);
    box-shadow: 0px 2px 6px 2px rgba(0,0,0,0.75);
    margin-bottom:20px;
}

img:hover {
  filter: none; /* IE6-9 */
  -webkit-filter: grayscale(0); /* Google Chrome, Safari 6+ & Opera 15+ */
 
}