• 부모의 영역을 따라가는게 바람직한데 두가지 방법이있다. inherit 그리고 100%

  • margin-left : auto - > 왼쪽으로 공백을 준다.
  • margin-right : auto - > 오른쪽으로 공백을 준다.

html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link href ="../css/style.css" type= "text/css" rel="stylesheet" >

</head>
<body>
    <!-- ------------header box-------------------------------------------------------- -->
    <header id ="header">
        <div class = "content-box">
            <!-- <h1><a href="../index.html">강깸 온라인</a></h1> -->
            <!-- <section>
                <h1 >서두</h1>
                
                <nav id ="main-menu">   
                    <h1>메인메뉴</h1>
                    <ul>
                        <li class = "first"><a href="a.html">학습가이드</a></li>
                        <li ><a href="b.html">강좌선택</a></li>
                        <li class ="aa"><a>AnswerIs</a></li>
                    </ul>
                </nav>

                <section>
                <h1>강좌검색폼</h1>
                    <form>
                        <fieldset>
                            <legend>검색입력필드</legend>
                            <lable>과정검색</lable>
                            <input type="text">
                            <input type="submit" value="검색"> 
                        </fieldset>
                    </form>
                </section>

                <nav>
                <h1>회원메뉴</h1>
                    <ul>
                        <li><a href="../index.html">HOME</a></li>
                        <li><a href="../member/login.html"></a>로그인</li>
                        <li><a href="../member/signup-agree.html">회원가입</a></li>
                    </ul>
                </nav>

                <nav>
                    <h1>바로가기메뉴</h1>
                    <ui>
                        <li><a href="">마이페이지</a></li>
                        <li><a href="list.html">고객센터</a></li> 
                    </ui>
                </nav>
            </section> -->
        </div>
    </header>
    <!-- ------------visual box-------------------------------------------------------- -->
    <div id ="visual">
        <div class = "content-box">
        
        </div>
    </div>
    <!-- ------------body box-------------------------------------------------------- -->

    <div id ="body">
        <div class = "content-box">
            <!-- 
            <aside>
            <h1>고객센터</h1>
                <nav>
                    <h1>고객센터메뉴</h1>
                        <ul>
                            <li><a href="">공지사항</a></li>
                            <li><a href="">자주하는 질문</a></li>
                            <li><a href="">수강문의</a></li>
                            <li><a href="">이벤트</a></li>
                        </ul>
                </nav>

                <nav>
                    <h1>협력업체</h1>
                    <ul>
                        <li><a href="">노트펍스</a></li>
                        <li><a href="">나무랩연구소</a></li>
                    </ul>
                </nav>
            </aside>
            <main>
        </div>
                <section>
                    <h1>공지사항</h1>

                    <section>
                    <h1>경로</h1>
                        <ol>
                            <li>home</li>
                            <li>고객센터</li>
                            <li>공지사항</li>
                        </ol>
                </section>

                    <section>
                        <h1>공지사항 검색폼</h1>
                        <form>
                            <fieldset>
                                <legend>검색어 입력필드</legend>
                                <lable>검색분류</lable>
                                <select>
                                    <option value="title">제목</option>
                                    <option value="writer">작성자</option>
                                </select>
                                <lable>검색어</lable>
                            
                                <input type="text">
                                <input type="submit" value="검색"> 
                            </fieldset>
                        </form>
                    </section>
                    
                    <section>
                        <h1>공지사항목록</h1>
                        <table border ="1">
                            <tr>
                                <td>번호</td>
                                <td>제목</td>
                                <td>작성자</td>
                                <td>작성일</td>
                                <td>조회수</td>
                            </tr>
                            <tr>
                                <td>3</td>
                                <td><a href="detail.html">안녕하세요. 뉴렉처선생님강의들으면서 연습하고있습니다.</a></td>
                                <td>kangkkaem</td>
                                <td>2022-01-09</td>
                            </tr>
                            <tr>
                                <td>3</td>
                                <td><a href="detail.html">html 수업 듣고있는데 너무 재밋어요.</a> </td>  
                                <td>kangkkaem</td>
                                <td>2022-01-09</td>
                            </tr>
                            <tr>
                                <td>3</td>
                                <td><a href="detail.html">어떻게 변화가될지기대됩니다.</a></td>
                                <td>kangkkaem</td>
                                <td>2022-01-09</td>
                            </tr>    
                        </table>
                    </section>

                    <section>
                        <h1>페이지정보</h1>
                        <div>
                        1 / 1 pages
                        </div>  
                    </section>
            

                    <nav>
                        <h1>페이저</h1>
                        <div>
                            <div>이전</div>
                            <ul>
                                <li>1</li>
                                <li>2</li>
                                <li>3</li>
                                <li>4</li>
                                <li>5</li>
                            </ul>
                            <div>다음</div>
                        </div>
                    </nav>
                </section>
            
            </main> -->
        </div>
    </div>
    <!-- ------------footer box-------------------------------------------------------- -->
    <footer id ="footer">
        <div class = "content-box">
            <!-- <section> 
                <h1>회사정보</h1>

                <section>
                    <h1>소유권자정보</h1>
                    <dl>
                    <dt>주소 : </dt>
                    <dd>서울특별시 마포구</dd>
                    <dt>관리자이메일:</dt> 
                    <dd>kangkkaem@naver.com</dd>
                    <dt>사업자 등록번호 :</dt>
                    <dd>123-45-67890</dd>
                    <dt>통신 판매업:</dt> 
                    <dd>신고제 2020-서울-0000 호</dd>
                    <dt>상호:</dt> 
                    <dd>강깸</dd>
                    <dt>대표:</dt>  
                    <dd>kangkkaem</dd>
                    <dt>전화번호 :</dt>
                    <dd>123-456-7899</dd>
                    </dl>
                </section>

                <section>
                    <h1>저작자연락처</h1>
                    <div>
                        Copyright ⓒ kangkkaem.com 2021-2022 All Right Reserved. Contact admin@kangkkame.com
                    </div>
                </section>     
            </section> -->
        </div>
    </footer>

</body>
</html> 

css

@import url(reset.css);

.content-box{
    height: inherit;
    width: 960px;
    margin-left: auto;
    margin-right: auto;
    background: #ff000020;
}


/* ---------------------------- */

#header{
    height: 70px;
    background: yellow;
}
  
#visual {
    height: 171px;
    background: green;
}

#body {
    height: 300px;
    background: red;
}

#footer{
    height: 100px;
    background: gray;
}

두번째방

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