style for gallery

gallery.css

#gallery ul {
display:-webkit-box;
display:-ms-flexbox;
display:flex;
-webkit-box-orient: horizontal;
-webkit-box-direction: normal;
-ms-flex-flow: row wrap;
flex-flow:row wrap;
-ms-flex-pack: distribute;
justify-content: space-around;
}
#gallery li {
list-style-type: none;
padding: 8px;
margin-right:6px;
margin-bottom: 6px;
border:1px solid silver;
vertical-align: top;
-webkit-box-flex: 1;
-ms-flex: auto;
flex: auto; width: 200px;
}