Creating a CSS triangle that expands the full width of the page

Here is a triangle:

#header-triangle-right {
    position: absolute;
    float: right;
    top:0px;
    right:0;
    z-index: 0;
    overflow: hidden;
    width: 0;
    height: 0;
    border-top: 400px solid transparent;
    border-right: 1000px solid #000000;
}

How can I make this triangle expand to cover 100% of the document when 'border' doesn't allow percentages?

Answer №1

If you're looking to achieve this effect using only CSS, there isn't a straightforward way to do it. However, with the use of jQuery, you can implement the following solution:

let windowWidth  = $(window).width(),
    windowHeight = $(window).height();

$('#header-triangle-right').css({
    'border-top'   : windowHeight + 'px solid transparent',
    'border-right' : windowWidth + 'px solid  #000'
});

You can also view and test the code on jsfiddle: http://jsfiddle.net/TzM5m/

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