php-我想在此编码中添加背景图像
<!DOCTYPE html>
<html lang="en">
<?php
session_start();
include('./db_connect.php');
ob_start();
// if(!isset($_SESSION['system'])){
$system = $conn->query("SELECT * FROM system_settings")->fetch_array();
foreach($system as $k => $v){
$_SESSION['system'][$k] = $v;
}
// }
ob_end_flush();
?>
<?php
if(isset($_SESSION['login_id']))
header("location:index.php?page=home");
?>
<?php include 'header.php' ?>
<body class="hold-transition login-page bg-black">
<h2><b><?php echo $_SESSION['system']['name'] ?> - Admin</b></h2>
<div class="login-box">
<div class="login-logo">
<a href="#" class="text-white"></a>
</div>
<!-- /.login-logo -->
<div class="card">
<div class="card-body login-card-body">
<form action="" id="login-form">
<div class="input-group mb-3">
<input type="email" class="form-control" name="email" required placeholder="Email">
<div class="input-group-append">
<div class="input-group-text">
<span class="fas fa-envelope"></span>
</div>
</div>
</div>
<div class="input-group mb-3">
<input type="password" class="form-control" name="password" required placeholder="Password">
<div class="input-group-append">
<div class="input-group-text">
<span class="fas fa-lock"></span>
</div>
</div>
</div>
<div class="form-group mb-3">
<label for="">Login As</label>
<select name="login" id="" class="custom-select custom-select-sm">
<option value="3">Student</option>
<option value="2">Faculty</option>
<option value="1">Admin</option>
</select>
</div>
<div class="row">
<div class="col-8">
<div class="icheck-primary">
<input type="checkbox" id="remember">
<label for="remember">
Remember Me
</label>
</div>
</div>
<!-- /.col -->
<div class="col-4">
<button type="submit" class="btn btn-primary btn-block">Sign In</button>
</div>
<!-- /.col -->
</div>
</form>
</div>
<!-- /.login-card-body -->
</div>
</div>
<!-- /.login-box -->
<script>
$(document).ready(function(){
$('#login-form').submit(function(e){
e.preventDefault()
start_load()
if($(this).find('.alert-danger').length > 0 )
$(this).find('.alert-danger').remove();
$.ajax({
url:'ajax.php?action=login',
method:'POST',
data:$(this).serialize(),
error:err=>{
console.log(err)
end_load();
},
success:function(resp){
if(resp == 1){
location.href ='index.php?page=home';
}else{
$('#login-form').prepend('<div class="alert alert-danger">Username or password is incorrect.</div>')
end_load();
}
}
})
})
})
</script>
<?php include 'footer.php' ?>
</body>
</html>
我如何能够将背景图像包含在其中，以及有关执行此过程的方式的细节。您建议我采取以下哪些措施？PHP 脚本语言用于创建此段落。如果您有任何问题，请不要犹豫，不要犹豫。对于你们每一位这样做的人，我将永远怀有世界上最深切的感谢和钦佩。我的计算机编程教育才刚刚开始。
