html,
body {
    height: 100%;
}

header,
#intro {
    height: 100%;
}

header.page {
    height: 50%;
}

header.article {
    height: 30%;
}

#intro {
    background: url("../img/apps/bg/bg1.jpg")no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

@media (min-width: 800px) {
    .mask .row {
        width: 30%;
        min-width: 0;
    }
}
@media screen and (max-width: 768px) {
    .mask .row {
        /* width: 100%; */
        min-width: 0;
    }
}


/* navbar */
.top-nav-collapse {
    background-color: #24355C;
}
@media (max-width: 768px) {
    .navbar:not(.top-nav-collapse) {
        background-color: #24355C;
    }
}
@media (min-width: 800px) and (max-width: 850px) {
    .navbar:not(.top-nav-collapse) {
        background-color: #24355C;
    }
}


.blockquote .display-4 {
    font-size: 3.5rem;
}