site/_src/_assets/styles/bigchain/_hero.scss

//
// Hero
// ---
// bigchain.io
//

$menu-height-md: 73px;

.hero {
    @extend .background--photo;
    background-image: url('/assets/img/northern-lights-poster.jpg');
    text-align: center;
    overflow: hidden;
    position: relative;

    // vertically center everything
    display: flex;
    align-items: center;
    min-height: 420px;
    flex-wrap: wrap;

    .section {
        @media ($screen-md) {
            min-height: calc(100vh - #{$menu-height-md});
        }
    }

    .logo--full {
        fill-opacity: .8;
        margin: 0 auto;
        max-width: 20em;
    }

    .section-title {
        color: #fff;

        &:after { display: none }
    }

    .btn {
        color: #fff;
        opacity: .8;
        position: absolute;
        bottom: ($spacer * 2);
        left: 0;
        right: 0;
        width: 100%;
        display: none;

        @media ($screen-md) {
            display: block;
        }

        &:hover,
        &:focus { opacity: 1; }

        // the caret
        .icon {
            width: 12px;
            height: 12px;
            stroke: #fff;
            display: block;
            margin: auto;
        }
    }

    // intro animation
    .logo--full,
    .section-title,
    .btn {
        @extend .animation-slide-in-from-bottom;
        animation-duration: 1s;
        animation-fill-mode: backwards;
    }

    .logo--full {
        animation-timing-function: $timing-default;
    }

    .section-title,
    .btn {
        @extend .animation-slide-in-from-bottom;
        animation-play-state: paused;
    }

    .btn { animation-delay: .2s; }

    &.is-ready {
        .section-title,
        .btn {
            animation-play-state: running;
        }
    }
}

.hero__content {
    position: relative;
    z-index: 1;
}


//
// Video hero
//
.hero-video {
    // hide color overlay to prevent double overlays
    // color overlay of hero-video__background will take over
    @media ($screen-md) {
        &:before { display: none }
    }
}

.hero-video .menu,
.hero-video__content,
.hero-video__video {
    @media ($screen-md) {
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
    }
}

.hero-video__content {

    @media ($screen-md) {
        z-index: 3 !important;
        bottom: 0;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
    }
}

// video container
.hero-video__background {
    @extend .color-overlay;
    display: none;

    @media ($screen-md) {
        display: block;
        margin-bottom: -9px;
        max-height: 100vh;
        margin-left: auto;
        margin-right: auto;
        width: 100%;

        &:before { z-index: 2; }
    }
}

// the video itself
.hero-video__video,
.hero-video__poster {
    @extend .img--responsive;
}

.hero-video__video {
    @extend .transition;
    opacity: 0;
    margin: auto;
    width: 100%;

    &.enabled {
        opacity: 1
    }
}

.hero-video__poster {
    display: block;
    opacity: 0;
}