要注意几点：
1.要使用绝对布局，子绝父相，body为相对定位，粒子效果和使用ZUI框架的面板的div为绝对定位，不能使用flex布局。
2.输入框要在粒子效果上面，使用z-index。
3.输入框面板的宽度不能写死，要使用百分比，使用margin-left实现左右居中，因为magin:0 auto；使用不了。
4.借鉴GitHub开源项目，https://github.com/VincentGarreau/particles.js
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>管理员登录</title>
<link rel="stylesheet" href="./dist/css/zui.min.css">
<link rel="stylesheet" media="screen" href="css/style.css">
</head>
<body>
<div id="particles-js"></div>
<div class="panel" id="main-content">
<div class="panel-heading" style="text-align: center; font-size: 18px;font-weight: bold;">
管理平台
</div>
<div class="panel-body">
<div class="input-group with-padding">
<span class="input-group-addon">用户</span>
<input type="text" class="form-control" placeholder="请输入用户">
</div>
<div class="input-group with-padding">
<span class="input-group-addon">密码</span>
<input type="password" class="form-control" placeholder="请输入密码">
</div>
<div class="input-group with-padding">
<span class="input-group-addon">验证码</span>
<input type="text" class="form-control" placeholder="请输入验证码">
<span class="input-group-addon fix-border fix-padding"></span>
<img src="./image/1.png" class="form-control">
</div>
<div class="with-padding">
<button class="btn btn-block" style="background-color: #6097EE;color: white;font-size: 18px;font-weight: bold;" type="button">登录</button>
</div>
</div>
</div>
<!-- scripts -->
<script src="./js/particles.js"></script>
<script src="js/app.js"></script>
<!-- stats.js -->
<script src="js/lib/stats.js"></script>
<script>
var count_particles, stats, update;
stats = new Stats;
stats.setMode(0);
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';
document.body.appendChild(stats.domElement);
count_particles = document.querySelector('.js-count-particles');
update = function() {
stats.begin();
stats.end();
requestAnimationFrame(update);
};
requestAnimationFrame(update);
</script>
</body>
<script src="./dist/lib/jquery/jquery.js"></script>
<script src="./dist/js/zui.min.js"></script>
</html>效果图
