100% Pure CSS Animated Drop-Down Info-Bar - Demonstrating the info-bar with a left-hand tab.

This page demonstrates the Pure CSS Info-Bar, except with its visible tab on the left. I also removed the box-shadows, as this variant looks more like paper filing to me!

First, move the generated "content" over to the left: .site-notice-bar::before { left: 0; }

If you have a border around your Info-bar (and tab) you will need to shift the generated tab left by the width of your border, to avoid an uneven edge, as I have done in this example.

We also need to move the rounded corners slightly, so there is no bottom-left rounded corner on the Info-Bar, which would spoil the straight line down the left edge into the visible tab. So we reset the corners (border-radius: 0;) and then give the Info-Bar only a rounded bottom-right (border-bottom-right-radius: .5rem;), while the generated tab gets both left and right..

Note how I also moved the margin-top up by .2rem, to avoid having the border show on the page (not that you would see it with this scheme, but it is there!). While I was at it, I moved the Info-Bar text left, to line up better with the tab and overall effect.

Here is the left-hand side variant (notes added)..

Quite paper-like, methinks..

/*
    Pure CSS Animated Drop-Down Info-Bar
    Left-Hand Tab Version

    ;o) @ corz.org
*/

.site-notice-bar::before, .site-notice-bar {
    transition: all 300ms ease-out;
    position: relative;
    display: block;
    background-color: #f9e7aa;
    color: #E8910D;
    border: solid .2rem #fbb627;
    font-weight: bold;
    font-size: 110%;
}

.site-notice-bar {
    width: 90%;
    padding: 1rem;
    margin: 10rem auto 3rem;
    border: solid .2rem #FFC44D;
    border-radius: .5rem;
    -khtml-opacity: 1;
    opacity: 1;
}

.site-notice-bar > p {
    margin: 1rem auto .5rem 1rem;
/*    max-width: 90%;*/
}

@media screen and (min-width: 921px) {

    .site-notice-bar::before, .site-notice-bar {
        position: absolute;
        border-top: none;
        border-radius: 0; /* reset corners */
        padding: 0;
    }

    .site-notice-bar::before {
        content: attr(data-tab-text);
        left: -.2rem; /* this is the tab's left hand position */
        margin-top: 12rem;
        padding: .5rem 1rem;
        cursor: pointer;
        z-index: 100;
        display: block;
        border-bottom-left-radius: .5rem;
        border-bottom-right-radius: .5rem;
    }

    .site-notice-bar {
        top: 0;
        margin-top: -12.2rem; /* .2rem added to remove visible border */
        height: 12rem;
        width: 80%;
        left: 10%;
        z-index: 101;
        -khtml-opacity: 0.66;
        opacity: 0.66;
        border-bottom-right-radius: .5rem; /* no left-hand corner */
    }

    .site-notice-bar:hover {
        margin: 0;
        -khtml-opacity: 1;
        opacity: 1;
    }
}

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;o) corz.org

Pure CSS Info-Bar (Left Hand Tab Demo)