What is the best way to dim the main content/canvas of a website when the side menu is displayed

Currently, I am utilizing Bootstrap 3 with the Jasny Off Canvas Reveal Menu template. You can view it here:

Everything is functioning well, but I have a specific goal in mind. I want to achieve a similar effect as seen on this site when clicking the hamburger menu icon in the above Jasny example:

http://material-ui.com/#/

On the Material-UI website, when the menu icon is clicked, the main content area to the right of the menu darkens and returns to its original state when the side menu disappears.

I'm aiming to implement this feature for the Jasny off-canvas reveal menu click event. It's crucial that it works on Internet Explorer 8 browser.

jquerycssinternet-explorer-8twitter-bootstrap-3jasny-bootstrap

Answer №1

To achieve this effect, you can simply insert the following CSS:

.canvas-slid:after,
.canvas-sliding:after {
    content: "";
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: auto;
    z-index: 9999;
    background: rgba(0,0,0,0.5) !important;
    background: url(./alpha.png);
}

If you need to support IE versions older than 8 which do not have rgba() support, you can use a 1x1px PNG with 50% alpha as the background image1.

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