B유형 슬라이드 오류

B유형 세로슬라이드 실습중에 오류가 있어 문의 드립니다.

마크업은 다 맞는 것 같은데 아예 움직이지를 않아요...

오늘 시험인데 갑자기 안되서 너무 속상합니다ㅠㅠ

<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>웹디자인기능사(유형B)</title>
    <link rel="stylesheet" href="css/style.css">
</head>
<body>

    <div class="container">
        <div class="header-inner">
            <header>
                <div class="header-logo"></div>
                <div class="navi"></div>
            </header>
        </div>
        <div class="content-inner">
            <div class="slide">
                <div class="slide-items">
                    <a class="slide-item" href="#none"><img src="images/slide-01.jpg" alt="slide-01"></a>
                    <a class="slide-item" href="#none"><img src="images/slide-02.jpg" alt="slide-02"></a>
                    <a class="slide-item" href="#none"><img src="images/slide-03.jpg" alt="slide-03"></a>
                </div>
            </div>
            <div class="items">
                <div class="news"></div>
                <div class="banner"></div>
                <div class="shortcut"></div>
            </div>
        </div>
        <div class="footer-inner">
            <footer>
                <div class="footer-logo"></div>
                <div class="copyright"></div>
                <div class="sns"></div>
            </footer>
        </div>
    </div>
    
</body>
</html>

@charset "utf-8";

body {
    margin: 0;
}

.container {}
.header-inner {
    background-color: #eee;
    display: flex;
    justify-content: center;
}
header {
    border: 1px solid #000;
    width: 1200px;
    display: flex;
    justify-content: space-between;
}
header > div {
    border: 1px solid #000;
    height: 100px;
}
.header-logo {
    width: 200px;
}
.navi {
    width: 600px;
}

.content-inner {}
.slide {
    width: 1200px;
    margin: auto;
}
.slide > div {
    border: 1px solid #000;
    height: 300px;
}
.items {
    width: 1200px;
    display: flex;
    margin: auto;
}
.items > div {
    border: 1px solid #000;
    height: 200px;
}
.news {
    width: 500px;
}
.banner {
    width: 350px;
}
.shortcut {
    width: 350px;
}

.footer-inner {
    background-color: #ddd;
    display: flex;
    justify-content: center;
}
footer {
    width: 1200px;
    display: flex;
}
footer > div {
    border: 1px solid #000;
    height: 100px;
}
.footer-logo {
    width: 200px;
}
.copyright {
    width: 1000px;
}
.sns {
    width: 200px;
}


/* Slide */
.slide {
    position: relative;
    height: 300px;
    font-size: 0;
}
.slide-items {
    position: absolute;
    top: 0;
    left: 0;
}
.slide-item {}

/* Slide */
// setInterval(콜백함수, 시간)
// animate({속성값}, 콜백함수)
setInterval(function(){
    $('.slide-items').animate({top: '-300px'}, function(){
        $('.slide-items').css({top: 0})
        $('.slide-item:first-child').appendTo('.slide-items')
    })
}, 3000)

인프런 커뮤니티 질문&답변