회원가입 과제 질문

선생님 강의 잘 보고 있습니다. 다름이 아니라 몇 가지 여쭤보고 싶어 글을 올리게 되었습니다.
정답코드를 따로 볼 수 있는 곳이 있을까요?
제 위의 코드에서 문제점이 있을까요?
button 기능이 활성화 되지 않는데 이유가 무엇인지 잘 모르겠습니다.
<!DOCTYPE html>
<html lang="ko">
<head>
    <title>Upgrade_sign_up_page</title>
    
    <style>

        #signup{
            width: 1920px;
            height:1080px;
            background-color: #FFFFFF;
            /* border:1px solid red; */

            display: flex;
            flex-direction: row;
            justify-content: center;
            align-items: center;
            
        }

        .main{
            box-sizing: border-box;
            width : 670px;
            height : 960px;
            border : 1px solid #AACDFF;
            padding : 60px;
            box-shadow: 7px 7px 39px rgba(0,104,255,0.25);
            border-radius: 20px;
            display: flex;
            justify-content: center;
        }

        .main2{
            width: 470px;
            height: 818px;
            /* border: 1px solid green; */
            display : flex;
            flex-direction:  column;
            align-items: center;
        }

        #introduce{
            width: 466px;
            height: 94px;
            font-family: 'Noto Sans CJK KR';
            font-style: normal;
            font-weight: 700;
            font-size: 32px;
            line-height: 47px;
            color : #0068FF
        }

        #group1{
            width: 466px;
            height: 80px;
            /* border: 1px solid red; */
        }

        #email{
            width: 158px;
            height: 23.65px;
            font-family: 'Noto Sans CJK KR';
            font-style: normal;
            font-weight: 400;
            font-size: 16px;
            line-height: 24px;
            color :#797979;
        }

        #vector1{
            width: 466px;
            height: 0px;
            border: 1px solid #0068FF;
        }
        
        #sex{
            width: 140px;
            height: 23.94px;
            display: flex;
            justify-content: space-between;
            
            font-family: 'Noto Sans CJK KR';
            font-style: normal;
            font-weight: 400;
            font-size: 16px;
            line-height: 24px;
            color : #000000
            /* border:1px solid #0068FF */
        }

        #checkbox{
            width: 454px;
            height: 21.06px;
            
            font-family: 'Noto Sans CJK KR';
            font-style: normal;
            font-size: 13px;
            line-height: 21px;
            color : #000000
        }

        #line{
            width: 470px;
            height: 1px;
            background-color: #E6E6E6;
        }

         button{
            width: 470px;
            height: 75px;
            background-color: #FFFFFF;
            border: 1px solid #0068FF;
            border-radius: 10px;

            display: flex;
            align-items: center;
            justify-content: center;
         }

        #button_text{
            width: 70px;
            height: 27px;

            font-family: 'Noto Sans CJK KR';
            font-style: normal;
            font-weight: 400;
            font-size: 17px;
            line-height: 27px;
            text-align: center;
            color : #0068FF
        }

    </style>
</head>
<body>
    <div id = "signup">
        <div class = "main">
            <div class = "main2">
                <div id = "introduce">
                    회원 가입을 위해<br>정보를 입력해주세요
                </div>
                <br>
                <div id = "group1">
                    <div id = "email">
                        *이메일
                    </div>
                    <input type ="text" style="border: none; width:200px;height: 50px;font-size: 30px;">
                    <div id = "vector1"></div>
                </div>
                <br>
                <div id = "group1">
                    <div id = "email">
                        *이름
                    </div>
                    <input type ="text" style="border: none; width:200px;height: 50px;font-size: 30px;">
                    <div id = "vector1"></div>
                </div>
                <br>
                <div id = "group1">
                    <div id = "email">
                        *비밀번호
                    </div>
                    <input type ="password" style="border: none; width:200px;height: 50px;font-size: 30px;">
                    <div id = "vector1"></div>
                </div>
                <br>
                <div id = "group1">
                    <div id = "email">
                        *비밀번호확인
                    </div>
                    <input type ="password" style="border: none; width:200px;height: 50px;font-size: 30px;">
                    <div id = "vector1"></div>
                </div>
                
                <br><br>
                
                <div id = "sex">
                    <div>
                        <input type = "radio" name = "gender">여성
                    </div>
                    <div>
                        <input type = "radio" name = "gender">남성
                    </div>
                </div>
                <br><br>
                <div id ="checkbox">
                    <input type = "checkbox"> 이용약관 개인정보 수집 및 이용, 마케팅 활용 선택에 모두 동의합니다.
                </div>
                <br><br>
                <div id = "line"></div>
                <br><br>
                <button>
                    <div id = "button_text">
                        가입하기
                    </div>
                </button>
            </div>
        </div>
    </div>
</body>
</html>
인프런 커뮤니티 질문&답변
