[attribute~="value"]

The selector [attribute~="value"] is used to select elements with an attribute value containing a specific word.
EXAMPLE
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Attribute selector [attribute~="value"]</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <style>
        * {
            box-sizing: border-box;
            font-family: "Segoe UI", system-ui, sans-serif;
        }
        
        body {
            margin: 0;
            padding: 30px;
            line-height: 1.6;
        }

        body p {
            background-color: #e6edf3!important;
            color: #333333!important;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            margin-bottom: 20px;
        }
        
        div[class~="important"] {
            background-color: #ffebee!important;
            color: #333333!important;
            border-left: 4px solid #f44336;
            padding: 15px;
            margin: 10px 0;
            border-radius: 4px;
        }
        
        div[class~="info"] {
            background-color: #e3f2fd!important;
            color: #333333!important;
            border-left: 4px solid #2196F3;
            padding: 15px;
            margin: 10px 0;
            border-radius: 4px;
        }
        
        div[class~="tip"] {
            background-color: #f1f8e9!important;
            color: #333333!important;
            border-left: 4px solid #8bc34a;
            padding: 15px;
            margin: 10px 0;
            border-radius: 4px;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 24px;
            text-decoration: none;
            border-radius: 6px;
            margin: 10px;
            transition: transform 0.2s, box-shadow 0.2s;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            color: white!important;
        }
        
        .btn-download {
            display: inline-block;
            padding: 12px 24px;
            border-radius: 6px;
            background: #0ea5e9!important;
            color: #fff!important;
            text-decoration: none;
            border: 0;
            cursor: pointer;
            box-shadow: 0 2px 5px rgba(0,0,0,.1);
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        
        .pdf {
            background-color: #2196F3!important;
        }
        
        .external {
            background-color: #FF9800!important;
        }
    </style>
</head>
<body>
<p>This example demonstrates the CSS selector [attribute~="value"], which selects elements whose attribute contains a 
specific word, separated by spaces. Below are three different types of notices and links:</p>

<div class="box important">
    Important notice: Save your work regularly.
</div>

<div class="box info">
    Information: CSS selectors are an important part of web styling.
</div>

<div class="box tip">
    Tip: Use descriptive class names for better code readability.
</div>

<button class="btn-download" onclick="window.print()">Download PDF</button>
<a href="https://vadnica.org" target="_blank" class="btn external">Open page in a new tab</a>
</body>
</html>
RESULT