[疑问]Inline元素的问题

.container{width:350px;background-color:#ccc;}span.box { display:inline;visibility:visible;line-height:100px;margin:0 100px;padding:20px 120px;border-top: 5px solid gray;border-bottom:5px solid black;border-left: 5px solid gray;border-right: 5px solid black;background-color:gold;}<div />

chrome下的显示结果：