html, body {
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
}
.content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

body {
    font-family: 'IBM Plex Sans KR', sans-serif;
    background-color: #F9FAFB;
}
.content-box {
    white-space: pre-wrap;
    overflow-wrap: break-word;
    height: calc(100vh - 64px - 80px); /* 헤더(64px) + 푸터(80px) 제외 */
    overflow-y: auto;
    flex: 1;
    padding: 20px;
    min-height: 0;
}