CSS3アニメーションで楽しい説明表示 | Chitep!

.container { background: url("../images/sample.jpg") no-repeat top left; height: 600px; background-size: 900px auto; position: relative; width: 900px; margin: 30px auto; } .container .box { width: 200px; height: 200px; text-align: center; position: absolute; z-index: 20; } .container .bd div { background: #fff; position: absolute; -webkit-transition: all 0.3s; -moz-transition: all 0.3s; transition