DOCTYPE html>html lang="ko">head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1.0"> title>회원가입title> link href="3.css" rel="stylesheet" type="text/css" /> head>body> h1>로그인h1> p class = "a">아이디와 비밀번호를 입력하고 로그인 하세요p> form id="signupForm" method="post" action="/signup"> div class ="c"> label for="username">strong>아..