How to Create a Slanted Corner in a CSS Box?

Applying a Slanted Corner to a CSS Box

To achieve a visually striking effect, sometimes it's desirable to introduce a slanted corner into a CSS box. This can instantly transform a simple rectangle into a dynamic and eye-catching element.

Creating a Cut-Corner Box

For browsers that support CSS3, the polygon property offers a powerful solution for this challenge. However, for broader browser compatibility, the Slantastic technique (http://meyerweb.com/eric/css/edge/slantastic/demo.html) may be a better alternative.

Implementing Slantastic

HTML:

<div class="cornered"></div>
<div class="main">Hello</div>

CSS:

.cornered {
    width: 160px;
    height: 0px;
    border-bottom: 40px solid red;
    border-right: 40px solid white;
}

.main {
    width: 200px;
    height: 200px;
    background-color: red;
}

Additional Options

To create a corner with transparent borders and text, you can implement the following alternative approach:

HTML:

<div class="outer">
    <div class="cornered">It's possible to put text up here, too...
    </div>
    <div class="main">Hello hello hello hello
    hello hello hello hello hello</div>
</div>

CSS:

.outer {
    background-color: #ccffff;
    padding: 10px;
    font-size: x-small;
}

.cornered {
    width: 176px;
    height: 0px;
    border-bottom: 40px solid red;
    border-left: 40px solid transparent;
}

.main {
    width: 200px;
    height: 200px;
    background-color: red;
    padding: 0 8px;
}

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