<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>视口知识</title>
</head>
<body>
<!--
em: 动态的字号,综实相对于自身或者父元素及根元素,如果根元素固定,em=rem
rem:静态的字号,总是相对于“根元素
vw:视口宽度百分比,1vm = 视口宽度1/100
vh:视口高度百分比,1vh = 视口高度1/100
-->
<div class="box"></div>
<style>
.box {
background-color: aqua;
/* width: 100%;
height: 100%; */
width: 50vw;
height: 80vh;
}
</style>
</body>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>定位与定位元素</title>
</head>
<body style="height: 1200px">
<!-- position:
static 静态定位-默认定位
relative 相对定位
-->
<h1>1.static 静态定位-默认定位</h1>
<h2>2.relative 相对定位,相对于自身</h2>
<div class="box">
<!-- 3.absolute 绝对定位 -->
<div class="wrap">3.absolute 绝对定位,相对于定位父级</div>
</div>
<div class="box2">4.fixed 固定定位,相对于body</div>
<style>
/* 添加边框 */
h1,
h2,
h3 {
border: 1px solid red;
}
h2 {
/* h2相对定位 */
position: relative;
top: 150px;
left: 100px;
right: 0;
bottom: 0;
}
/* h3绝对定位 */
.box {
width: 300px;
height: 250px;
border: 1px solid red;
background-color: wheat;
/* 父元素为非static的定位属性,就转为定位元素 */
position: relative;
/* position: absolute; */
}
.box .wrap {
width: 100px;
height: 80px;
border: 1px solid black;
background-color: lawngreen;
/* 相对定位 */
/* position: relative;
top: 20px;
left: 20px; */
/* 绝对定位 */
position: absolute;
top: 30px;
left: 50px;
}
.box2 {
width: 120px;
height: 120px;
background-color: gold;
position: fixed;
top: 450px;
right: 0;
}
</style>
</body>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>模态框</title>
<link rel="stylesheet" href="modal.css" />
</head>
<body>
<!-- 头部 -->
<header>
<div class="title">某某内容管理系统</div>
<button onclick="showModal()">登录</button>
</header>
<div class="mail">网站中心内容区</div>
<!-- 模态框内容区 -->
<div class="modal">
<!-- 1.半透明的遮罩 -->
<div class="modal-bg" onclick="closeModal()"></div>
<!-- 2.弹层表单 -->
<form action="" class="modal-form">
<fieldset style="display: grid; gap: 1em">
<legend>用户登陆</legend>
<input type="text" name="username" placeholder="请输入用户名" />
<input type="password" name="password" placeholder="请输入密码" />
<button>登录</button>
</fieldset>
</form>
</div>
<script src="modal.js"></script>
</body>
</html>
/* 初始化 */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/* 头部样式 */
header {
padding: 0.5em 1em;
background-color: grey;
display: flex;
}
header .title {
font-size: x-large;
font-weight: lighter;
letter-spacing: 2px;
text-shadow: 1px 1px 1px;
display: flex;
}
/* 登陆按钮 */
header button {
margin-left: auto;
width: 5em;
border: none;
border-radius: 0.5em;
}
header button:hover {
cursor: pointer;
background-color: rebeccapurple;
color: floralwhite;
/* 盒子加阴影 发光效果 */
/* box-shadow: 向右,向下,模糊半径,颜色; */
box-shadow: 0 0 5px #fff;
/* 过渡效果 */
transition: 0.5s;
}
/* 模态框 */
.modal .modal-form fieldset {
height: 15.5em;
background-color: lightcyan;
border: none;
padding: 2em 3em;
box-shadow: 0 0 5px #888;
}
/* 模态框表单标题 */
.modal .modal-form fieldset legend {
padding: 7px 1.5em;
background-color: lightseagreen;
color: white;
}
.modal .modal-form fieldset input {
height: 3em;
padding-left: 1em;
outline: none;
border: 1px solid #ddd;
font-size: 14px;
}
/* :focus: 表单控件,获取焦点时的样式 */
.modal .modal-form fieldset input:focus {
box-shadow: 0 0 8px #888;
border: none;
}
.modal .modal-form fieldset button {
background-color: lightseagreen;
color: white;
border: none;
height: 3em;
font-size: 16px;
height: 2.5em;
}
.modal .modal-form fieldset button:hover {
background-color: coral;
cursor: pointer;
}
/* 定位 */
.modal .modal-form {
/* 固定定位 */
position: fixed;
top: 12em;
/* 正中间 */
left: 38em;
right: 38em;
}
/* 遮罩 */
.modal .modal-bg {
position: fixed;
/* 定位到坐标的四个顶点 */
top: 0;
left: 0;
right: 0;
bottom: 0;
/* 半透明 */
background-color: rgba(0, 0, 0, 0.5);
}
/* 隐藏整个模态框 */
.modal {
display: none;
}
/* 内容区显示 */
.mail {
height: 500px;
width: auto;
top: 30px;
display: relative;
}
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