body部分内容：
<body>
<form id="form_id" name="form_id" method="get" action="http://baidu.com" onsubmit="return checkUser()">
<div id="loginForm">
<div id="loginTitle">LOGIN</div>
<div id="loginContent">
<div id="user_info">
<label>Username:</label><img src="./user.png" /><input id="login_username" type="text" name="login_username" maxlength="32" placeholder="Username" />
<br />
<label>Password:</label><img src="./pwd.png" /><input id="login_password" type="password" name="login_password" maxlength="32" placeholder="Password" />
</div>
<div id="user_help">
<input id="login_save" type="checkbox" /><label>Remember me</label> | <a href="#" target="_blank">Forgot password?</a>
</div>
</div>
<div id="loginButton">
<div id="register"><input id="register_button" type="button" name="regButton" value="register" onclick="register()" /></div>
<div id="login"><input id="login_button" type="submit" name="login_button" value="login" /></div>
</div>
</div>
</form>
</body>
style部分内容：
<style>
html,body,div{
margin:0;
padding:0;
font-size:100%;
}
html{
background:url('./bgeight.jpg') no-repeat;
background-size:cover;
}
#loginForm{
height:200px;
width:350px;
position:absolute;
top:50%;
left:50%;
margin:-100px 0 0 -175px;
box-shadow:0px 0px 25px 12px #c0c0c0;
border:6px solid;
border-color:#c0c0c0;
border-radius:12px;
}
#loginTitle{
height:50px;
width:100%;
font-family:blazed,Kunstler Script"New York",Georgia;
font-weight:bold;
font-style:oblique;
font-size:2em;
text-align:center;
line-height:50px;
//-webkit-text-stroke:10px black;
color:white;
text-shadow:1px 1px 0 rgba(107,223,248,0.8),2px 2px 0 rgba(107,223,248,0.8),3px 3px 0 rgba(107,223,248,0.8),4px 4px 0 rgba(107,223,248,0.8),5px 5px 0 rgba(107,223,248,0.8);
}
#loginContent{
height:110px;
width:100%;
position:relative;
}
#loginButton{
height:40px;
width:100%;
}
#register{
height:40px;
width:175px;
float:left;
}
#login{
height:40px;
width:175px;
float:left;
}
#register_button{
height:40px;
width:175px;
background:none;
border-radius:6px;
border:1px solid;
border-color:#808080;
box-shadow:0px 0px 10px 0px #c0c0c0 inset;
font-weight:bold;
}
#login_button{
height:40px;
width:175px;
background:none;
border-radius:6px;
border:1px solid;
border-color:#808080;
box-shadow:0px 0px 10px 0px #c0c0c0 inset;
font-weight:bold;
}
#user_info{
position:absolute;
height:80px;
width:250px;
left:75px;
top:0px;
}
#user_help{
position:absolute;
height:30px;
width:230px;
left:60px;
top:80px;
}
label{
font-weight:bold;
width:20px;
}
#user_info input{
background:none;
width:175px;
}
input[type=checkbox]{
vertical-align:middle;
margin-top:0;
}
#user_help input,#user_help label,#user_help a{
line-height:30px;
font-size:12px;
}
img{
height:20px;
width:20px;
display:block;
float:left;
}
#user_info label{
display:block;
}
</style>
简单的登陆名与密码判断：
<script>
function checkUser(){
var Username=document.getElementById('login_username').value;
var Password=document.getElementById('login_password').value; if(Username==""||Username==null){
alert("The Username can't be null");
return false;
}
if(Password==""||Password==null){
alert("The Password can't be null");
return false;
}
else
{
return true;
}
}
</script>
这个示例采用CSS3的一些特性来制作的，自己学习HTML5+CSS3的一个练习作品，请大家欣赏与指导，谢谢！
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