[CSS] 의사 요소 (before / after)

Stack/CSS

[CSS] 의사 요소 (before / after)

7ingout 2022. 4. 11. 09:34

::before(:before)

- 선택한 요소의 첫 자식으로 요소를 하나 생성

- 기본값은 인라인

- content 속성과 함께 사용하며 장식용 콘텐츠를 추가할 때 사용

div::before {

content: "그린";

}

<div>그린컴퓨터</div> 이케 div 내에 생김

그린<div>컴퓨터</div>가 아니라

::after(:after)

header.html (초안)

<!DOCTYPE html>
<html lang="en">
<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>Document</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        #wrap {
            width: 1200px;
            margin: 0 auto;
        }
        #header { text-align: center; } /* text-align은 내 안에 있는 인라인 요소만 정렬 */
        h1 { background: red; width: 400px; margin: 0 auto; display: inline-block; } /* margin: 0 auto (block 태그 중앙으로) 중앙에 보내는 유일한 방법 */
        a { background: blue; color: #000; }
    </style>
</head>
<body>
    <div id="wrap">
        <div id="header">
            <h1><a href="#"><img src="images/logo.png" alt="씨큐아이"></a></h1>
            <ul id="menu">
                <li><a href="#">menu1</a></li>
                <li><a href="#">menu2</a></li>
                <li><a href="#">menu3</a></li>
                <li><a href="#">menu4</a></li>
                <li><a href="#">menu5</a></li>
            </ul>
            <ul id="gnbmenu">
                <li><a href="#"><img src="images/language_icon.png" alt="언어선택아이콘"></a></li>
                <li><a href="#"><img src="images/search_icon.png" alt="검사아이콘"></a></li>
                <li><a href="#"><img src="images/sitemap_icon.png" alt="사이트맵아이콘"></a></li>
            </ul>
        </div>
    </div>
</body>
</html>

header.html

<!DOCTYPE html>
<html lang="en">
<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>Document</title>
    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        li { list-style:  none;}
        #wrap {
            width: 1200px;
            margin: 0 auto;
        }
        #header {
            text-align: center;
            padding-top: 30px;
            padding-bottom: 30px;
            background: lightcyan;
        }
        #header h1 {
            float: left;
        }
        #header #gnbmenu {
            float: right;
        }
        #header #gnbmenu li {
            float: left;
            padding: 0 10px;
        }
        #header #menu {
            display: inline-block;
        }
        #header #menu li {
            float: left;
            padding: 0 20px;
        }
        .clearBoth::after { /* float 쓸 때 미리 만들기, 얘 필수 무조건 ! */
            content: "";
            display: block;
            clear: both;
        } 
        a { text-decoration: none; color: inherit; }
        li i {
            color: red;
        }
        li .material-icons {
            font-size: 42px;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <div id="header" class="clearBoth">
            <h1><a href="#"><img src="images/logo.png" alt="씨큐아이"></a></h1>
            <ul id="menu">
                <li><a href="#">menu1<i class="material-icons">cake</i></a></li>
                <li><a href="#">menu2</a></li>
                <li><a href="#">menu3</a></li>
                <li><a href="#">menu4</a></li>
                <li><a href="#">menu5</a></li>
            </ul>
            <ul id="gnbmenu">
                <li><a href="#"><img src="images/language_icon.png" alt="언어선택아이콘"></a></li>
                <li><a href="#"><img src="images/search_icon.png" alt="검사아이콘"></a></li>
                <li><a href="#"><img src="images/sitemap_icon.png" alt="사이트맵아이콘"></a></li>
            </ul>
        </div>
    </div>
</body>
</html>