前言

本篇文章是用HTML和CSS创建的星空和月亮背景动态特效，适用于小白学习（我也是小白，要是有什么错误的地方，欢迎大佬留言指正）

一、主要用到的东西

html做基本的渲染布局，css来填充样式

二、使用步骤

1.HTML部分代码

<!doctype html>
<html>
<head>
<meta charset="gb2312">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>纯CSS3夜晚天空月亮动画特效 </title>
<link type="text/css" href="css/main.css" rel="stylesheet">
<link type="text/css" href="css/0001245c2.css" rel="stylesheet">
</head>
<body><div id="e_background"><div id="e_smallstars"></div><div id="e_moon"></div>
</div>
</div>
</body>
</html>

2.填充样式，布局。

CSS部分代码如下(0001245c2.css)：

body{position:relative}
#e_background{background:#022436 url(../img/e_stars.png) repeat 20% 20%;position:fixed;top:0;left:0;right:0;bottom:0;z-index:-100;-webkit-animation:stars-anim 600s infinite linear;-moz-animation:stars-anim 600s infinite linear;-o-animation:stars-anim 600s infinite linear;animation:stars-anim 600s infinite linear}
#e_smallstars{background:url(../img/smallstars.png) repeat 20% 20%;position:absolute;top:0;left:0;right:0;bottom:0;opacity:1;z-index:-50;-webkit-animation:light 4s infinite alternate;-moz-animation:light 4s infinite alternate;-o-animation:light 4s infinite alternate;animation:light 4s infinite alternate}
#e_moon{background:url(../img/e_moon2.png) no-repeat 35% 35%;position:absolute;top:0;left:0;right:0;bottom:0;opacity:1;z-index:-25;-webkit-animation:moon-anim 100s infinite linear;-moz-animation:moon-anim 100s infinite linear;-o-animation:moon-anim 100s infinite linear;animation:moon-anim 100s infinite linear}
@media only screen and (max-width:480px){#e_moon{background:url(../img/e_moon2_sm.png) no-repeat 35% 35%}}
@media only screen and (min-width:481px) and (max-width:767px){#e_moon{background:url(../img/e_moon2_md.png) no-repeat 35% 35%}@-webkit-keyframes moon-anim{from{background-position:0 2%}to{background-position:110% 2%}}
@-moz-keyframes moon-anim{from{background-position:0 2%}to{background-position:110% 2%}}
@-o-keyframes moon-anim{from{background-position:0 2%}to{background-position:110% 2%}}
@keyframes moon-anim{from{background-position:0 2%}to{background-position:110% 2%}}
@-webkit-keyframes stars-anim{from{background-position:5% 600%}to{background-position:1300% 5%}
}
@-moz-keyframes stars-anim{from{background-position:5% 600%}to{background-position:1300% 5%}}
@-o-keyframes stars-anim{from{background-position:5% 600%}to{background-position:1300% 5%}}
@keyframes stars-anim{from{background-position:5% 600%}to{background-position:1300% 5%}
}
@-webkit-keyframes light{0%{opacity:.1}25%{opacity:.35}50%{opacity:.95}100%{opacity:.2}
}
@-moz-keyframes light{0%{opacity:.1}25%{opacity:.35}50%{opacity:.95}100%{opacity:.2}
}
@-o-keyframes light{0%{opacity:.1}25%{opacity:.35}50%{opacity:.95}100%{opacity:.2}}
@keyframes light{0%{opacity:.1}25%{opacity:.35}50%{opacity:.95}100%{opacity:.2}}

CSS部分代码如下(main.css)：

@charset "utf-8";
@import url(http://fonts.useso.com/css?family=Play);
html, body, div, section, article, aside, header, hgroup, footer, nav, h1, h2, h3, h4, h5, h6, p, blockquote, address, time, span, em, strong, img, ol, ul, li, figure, canvas, video, th, td, tr {margin: 0;padding: 0;border: 0;font: inherit;
}body {width: 60%;margin: 5% auto;font-family:  'Play', sans-serif;
}#content {background-color: rgba(255,255,255,.5);width: 70%;height: 100%;padding: 5%;border-radius: 25px;margin: 5% auto;
}#content > p {width: 90%;padding: 10px 5px;margin: 0 auto;text-align: center;
}#content h1 {color: #cc0;font-size: 1.4em;font-weight: bold;width: 90%;padding: 5px 2.5%;margin: 5px auto;text-align: center;
}
#content p {color: black;padding: 5px;margin: 5px;
}
/* -------------------- Mobile Style -------------------- */
@media only screen and (max-width:480px) {
body {width: 90%;
}
#content {width: 90%;
}
}/* -------------------- Tablet Style -------------------- */
@media only screen and (min-width:481px) and (max-width:767px) {
body {width: 80%;
}
#content {width: 85%;
}
}.btn {color: #ccf;display: inline-block;padding: 6px 12px;margin-bottom: 0;font-size: 20px;font-weight: normal;line-height: 1.42857143;text-align: center;white-space: nowrap;vertical-align: middle;-ms-touch-action: manipulation;touch-action: manipulation;cursor: pointer;-webkit-user-select: none;-moz-user-select: none;-ms-user-select: none;user-select: none;background-image: none;border: 1px solid transparent;border-radius: 4px;text-decoration: none;
}
.btn:focus,
.btn:active:focus,
.btn.active:focus,
.btn.focus,
.btn:active.focus,
.btn.active.focus {outline: thin dotted;outline: 5px auto -webkit-focus-ring-color;outline-offset: -2px;color: firebrick;
}
.btn:hover,
.btn:focus,
.btn.focus {color: #333;text-decoration: none;}
.btn:active,
.btn.active {background-image: none;outline: 0;-webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);
}