试图弄清楚如何利用 CSS 动画和重叠元素。
本质上，我 div 叫 Steven，让他一半坐在 div 地面上，一半坐在名为 moon 的 div 上（有动画）
页：
<style>
body {
background-repeat: no-repeat;
background: -moz-linear-gradient(top, #1e5799 0%, #2989d8 50%, #207cca 51%, #7db9e8 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#1e5799), color-stop(50%,#2989d8), color-stop(51%,#207cca), color-stop(100%,#7db9e8)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%); /* IE10+ */
background: linear-gradient(to bottom, #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#7db9e8',GradientType=0 ); /* IE6-9 */
height: 100%;
margin: 0;
background-repeat: no-repeat;
background-attachment: fixed;
-webkit-animation: sky-to-black 5s ease forwards;
-moz-animation: sky-to-black 5s ease forwards;
-ms-animation: sky-to-black 5s ease forwards;
}
.ground {
position: relative;
top: 50%;
left: 0;
width: 100%;
height: 50%;
background: black;
-webkit-animation: ground-to-black 5s ease forwards;
-moz-animation: ground-to-black 5s ease forwards;
-ms-animation: ground-to-black 5s ease forwards;
}
.moon {
width: 100px;
height: 100px;
position: absolute;
background: white;
border-radius: 0px;
box-shadow: 0 0 20px white;
left: 50%;
top: 80%;
margin: 0 -50px;
-webkit-animation: rising-sun 5s ease forwards;
-moz-animation: rising-sun 5s ease forwards;
-ms-animation: rising-sun 5s ease forwards;
}
.ground, .moon {
text-indent: -9999px;
overflow: hidden;
}
@-moz-keyframes rising-sun {
0% {
top: 80%;
box-shadow: 0 0 20px 100px white;
}
100% {
top: 15%;
box-shadow: 0 0 150px 20px white;
}
}
@-webkit-keyframes rising-sun {
0% {
top: 80%;
box-shadow: 0 0 20px 100px white;
}
100% {
top: 15%;
box-shadow: 0 0 150px 20px white;
}
}
@-ms-keyframes rising-sun {
0% {
top: 80%;
box-shadow: 0 0 20px 100px white;
}
100% {
top: 15%;
box-shadow: 0 0 150px 20px white;
}
}
@-moz-keyframes sky-to-black {
0% {
background-color: #133d48;
}
100% {
background-color: black;
}
}
@-moz-keyframes ground-to-black {
0% {
background-color: #211d11
}
100% {
background-color: black;
}
}
@-webkit-keyframes sky-to-black {
0% {
background-color: #133d48;
}
100% {
background-color: black;
}
}
@-webkit-keyframes ground-to-black {
0% {
background-color: #211d11
}
100% {
background-color: black;
}
}
@-ms-keyframes sky-to-black {
0% {
background-color: #133d48;
}
100% {
background-color: black;
}
}
@-ms-keyframes ground-to-black {
0% {
background-color: #211d11
}
100% {
background-color: black;
}
}
#Central {
width: 100%;
}
#Steve {
width: 500px;
height:500px;
background: #fff;
margin-top: 250px;
position:relative;
}
</style>
<div id="container">
<div class="moon">
</div>
<div id="Central" style="color: #fff; width:100%; Text-align: Center;"><h1>Welcome to my Minecraft Mods!</h1></div>
<div id="Steve"></div>
<div class="ground">
</div>
</div>
问题：
为什么我不能将带有白框的 div 标签放在中间的所有内容之上？