mine.css

* {
    box-sizing: border-box; /*내용+패딩+보더 크기계산*/
    margin: 0;
    padding: 0;
}

html {
    background: url("background_img.jpg") no-repeat; /*배경반복여부*/
    background-size: cover;
}

.nav-wrapper {
    padding: 20px; /*요소의 외부여백공간*/
    display: flex; /*너비만큼 가로방향 배치*/
    justify-content: flex-end; /*아이템 오른쪽 정렬*/
    align-items: center; /*수직방향에서 가운데 정렬*/
}

ul {
    display: flex;
    list-style-type: none;
}

.nav li {
    padding: 0 15px;
}

.nav li a {
    text-decoration: none;
}

.nav li a:link {
    color: white;
}

.nav li a:hover {
    color: skyblue;
}

.logo {
    margin-right: auto;
}

.main-text {
    text-align: center;
    padding: 100px;
    color: white;
}

.card {
    width: 300px;
    background-color: white;
    overflow: hidden; /*넘치는부분 보여주지않음*/
    border-radius: 10px;
    box-shadow: 0px 2px 20px pink; /*그림자*/
    margin: 30px;
    transition: 0.3s;
    position: relative;
}

.card-banner img {
    width: 100%;
    height: 230px;
    object-fit: cover; /*비율유지하며 공간 꽉채움*/
    position: absolute;
}

.card-wrapper {
    display: flex;
    flex-wrap: wrap; /*아래줄바꿈*/
    justify-content: center;
}

.card-body {
    margin: 240px 15px 15px;
}

.hashtag {
    font-size: 12px;
    color: cornflowerblue;
}

.title {
    font-weight: 800;
    font-size: 20px;
    margin-bottom: 5px;
}

.desc {
    font-size:  15px;
}

.card:hover {
    transform: translateY(-10px);
}