body {
    
}

header.masthead {
    padding-top: 6rem;
    padding-bottom: 1rem;
    text-align: center;
    color: #fff;
    background-image: url(../assets/img/intro-bg.jpg);
    background-repeat: no-repeat;
    background-attachment: scroll;
    background-position: center center;
    background-size: cover;
    /* 추가 */
    position: relative;
    isolation: isolate;
}

    header.masthead::after {
        content: '';
        position: absolute;
        background: black;
        z-index: -1;
        inset: 0;
        opacity: 0.5;
    }
    header.masthead .masthead-subheading {
        font-style: normal !important;
    }
    section.page-section {
        min-height: calc(70vh);
    }

.page-section {
    padding-top: 1rem !important;
}

#mainNav .navbar-nav .nav-item {
    margin-right: 0rem !important;
}

.tooltip.error-tooltip .tooltip-inner {
    max-width: 560px;
    white-space: pre-wrap;
    text-align: left;
    word-break: break-word;
}