CSS - 定位器

使用說明

static 靜態
relative 相對
absolute絕對-對DOM的上層為基準。若沒有以下設定會以頁面為基準
- relative
- absolute
- fixed
fixed固定

定位與深度

@charset "utf-8";

.box-out,
.box-in {
	padding: 10px;
}

.box-out{
	margin: 20px auto;
	width: 800px;
	height: 500px;
	background-color: pink;
	
	position: relative;

}

.box-in-1 {
	/* 我是子層的哥哥 */
	/* 若box-out不加relative 則 absolute + top + left 為網頁為基準 */
	top: 0;
	left: 100px;
	width: 200px;
	height: 300px;
	background-color: yellowgreen;
	z-index: 2;
}

.box-in-2 {
	/* 我是子層的弟弟 */
	z-index: 1;
	top:250px;
	left: 200px;
	width: 300px;
	height: 100px;
	background-color: brown;
}

.box-in{
	position: absolute;
}

<body>
	<div class="box-out">
		我是父層
		<div class="box-in box-in-1">我是子層的哥哥</div>
		<div class="box-in box-in-2">我是子層的弟弟</div>
	</div>
</body>

固定廣告

@charset "utf-8";
.text-center {
    text-align: center;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body,
button {
    font-family: Arial, Helvetica, "微軟正黑體", sans-serif;
}

.wrap {
    width: 960px;
    margin-left: auto;
    margin-right: auto;
}

.dialog__head {
    border-bottom: solid 1px #ddd;
}

.dialog__body,
.dialog__foot {
    padding: 15px;
}

.dialog__title {
    margin: 0;
    padding: 15px;
    width: 100%;
    font-size: 26px;
    text-align: center;
}

.dialog__desc {
    margin: 0;
    color: #666;
}

.dialog__head .btn__inner {
    position: absolute;
    right: 15px;
    top: 15px;
}

.dialog__foot .btn__inner {
    text-align: center;
}

.btn {
    line-height: 1;
    background-color: transparent;
    border: none;
}

.btn-close {
    font-size: 25px;
    color: #ccc;
}

.btn-peace,
.btn-cancel {
    padding: 10px 20px;
    margin-left: 5px;
    margin-right: 5px;
    font-size: 16px;
    border-radius: 3px;
}

.btn-peace {
    color: #fff;
    background-color: #228be6;
}

.btn-cancel {
    color: #000;
    background-color: #ddd;
}

.ovl-dark {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .5);
}

.dialog {
    /*
    example 1
    position: fixed;
    left:50%;
    top:50%; 
    margin-top: -200px;
    margin-left: -91px; 
    */
    /* 
    example 2 
    position: fixed;
    top:0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    position: fixed;
    width: 400px;
    height: 183px;
    background-color: #fff;
}

    <div class="dialog">
        <div class="dialog__head clearFix">
            <h6 class="dialog__title">系統訊息</h6>
            <div class="btn__inner">
                <button class="btn btn-close" type="button"><i class="fas fa-times"></i></button>
            </div>
        </div>
        <div class="dialog__body text-center">
            <p class="dialog__desc">是否要加入我們的學習計畫？</p>
        </div>
        <div class="dialog__foot">
            <div class="btn__inner">
                <button class="btn btn-peace" type="button">確定</button>
                <button class="btn btn-cancel" type="button">取消</button>
            </div>
        </div>
    </div>

	<div class="container mx-auto navi">
		<ul class="navi__ls">
			<li class="navi__item">
				<a href="javascript:;">政治</a>
				<ul>
					<li><a href="javascript:;">政治首頁</a></li>
					<li><a href="javascript:;">政治影音</a></li>
					<li><a href="javascript:;">全民立法院</a></li>
					<li><a href="javascript:;">風向台灣</a></li>
				</ul>
			</li>
			<li class="navi__item">
				<a href="javascript:;">財經</a>
				<ul>
					<li><a href="javascript:;">財經首頁</a></li>
					<li><a href="javascript:;">股市匯市</a></li>
					<li><a href="javascript:;">房地產</a></li>
					<li><a href="javascript:;">產業動態</a></li>
					<li><a href="javascript:;">理財就業</a></li>
					<li><a href="javascript:;">財經影音</a></li>
					<li><a href="javascript:;">網路商機</a></li>
					<li><a href="javascript:;">股神巴菲特</a></li>
					<li><a href="javascript:;">逐夢台灣</a></li>
				</ul>
			</li>
			<li class="navi__item">
				<a href="javascript:;">論壇</a>
				<ul>
					<li><a href="javascript:;">論壇首頁</a></li>
					<li><a href="javascript:;">政事觀察站</a></li>
					<li><a href="javascript:;">職場精力湯</a></li>
					<li><a href="javascript:;">愛的培養皿</a></li>
					<li><a href="javascript:;">健康大補帖</a></li>

				</ul>
			</li>
			<li class="navi__item">
				<a href="javascript:;">娛樂</a>
				<ul>
					<li><a href="javascript:;">娛樂首頁</a></li>
					<li><a href="javascript:;">藝人動態</a></li>
					<li><a href="javascript:;">電影戲劇</a></li>
					<li><a href="javascript:;">音樂</a></li>
					<li><a href="javascript:;">日韓</a></li>
					<li><a href="javascript:;">相信My音樂</a></li>
				</ul>
			</li>
			<li class="navi__item">
				<a href="javascript:;">運動</a>
				<ul>
					<li><a href="javascript:;">運動首頁</a></li>
					<li><a href="javascript:;">棒球</a></li>
					<li><a href="javascript:;">籃球</a></li>
					<li><a href="javascript:;">高爾夫</a></li>
					<li><a href="javascript:;">網球</a></li>
				</ul>
			</li>
			<li class="navi__item">
				<a href="javascript:;">社會地方</a>
				<ul>
					<li><a href="javascript:;">社會地方首頁</a></li>
					<li><a href="javascript:;">大台北</a></li>
					<li><a href="javascript:;">北台灣</a></li>
					<li><a href="javascript:;">中部</a></li>
					<li><a href="javascript:;">離島</a></li>
					<li><a href="javascript:;">南台灣</a></li>
					<li><a href="javascript:;">東台灣</a></li>
				</ul>
			</li>

			<li class="navi__item">
				<a href="javascript:;">國際</a>
				<ul>
					<li><a href="javascript:;">國際首頁</a></li>
					<li><a href="javascript:;">亞澳</a></li>
					<li><a href="javascript:;">中港澳</a></li>

				</ul>
			</li>
		</ul>
	</div>

@charset "utf-8";

.container {
	width: 1050px;
}

.mx-auto {
	margin-left: auto;
	margin-right: auto;
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

body {
	font-size: 15px;
	font-family: Arial, "微軟正黑體";
	background-color: #f6f6f6;
}

.navi,
.content {
	margin-top: 15px;
	margin-bottom: 15px;
}

.content {
	background-color: #eee;
	border: solid 1px transparent;
}

.content p {
	margin: 15px;
	line-height: 1.5em;
}

.navi{
	height: 40px;
}

.navi__item{
	float: left;
	position: relative;
}

.navi__item >a{
	text-align: center;
}

.navi__item a{
	display: block;
	width: 150px;
	padding: 10px;
	color: #fff;
	text-decoration: none;
	background-color: #1ab394;	
}

.navi__item ul{
	display: none;
	position: absolute;
	top:100%;
	left: 0;

}

.navi__item a:hover{
	background-color: #23d4b0;
}

.navi__item:hover ul{
	display: block;
}

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使用說明

定位與深度

固定廣告

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