Adding break point by using media query in CSS3. example

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<!DOCTYPE html>
<html>
	<head>
		<title>Demo</title>
	</head>
<body>
<style>
    * {
        box-sizing: border-box;
    }

.row:after {
        content: "";
        clear: both;
        display: block;
    }

[class*="col-"] {
        float: left;
        padding: 15px;
    }

html {
        font-family: "Lucida Sans", sans-serif;
    }

.header {
        background-color: #b6ff00;
        color: #ffffff;
        padding: 15px;
    }

.menu ul {
        list-style-type: none;
        margin: 0;
        padding: 0;
    }

.menu li {
        padding: 8px;
        margin-bottom: 7px;
        background-color: #ff004e;
        color: #ffffff;
        box-shadow: 0 2px 2px rgba(0,0,0,0.12), 0 2px 2px rgba(0,0,0,0.24);
    }

.menu li:hover {
            background-color: #000000;
        }

.aside {
        background-color: #ff004e;
        padding: 15px;
        color: #ffffff;
        text-align: center;
        font-size: 14px;
        box-shadow: 0 2px 2px rgba(0,0,0,0.12), 0 2px 1px rgba(0,0,0,0.24);
    }

.footer {
        background-color: #000000;
        color: #ffffff;
        text-align: center;
        font-size: 12px;
        padding: 15px;
    }
    /* For desktop: */
    .col-1 {
        width: 8.33%;
    }

.col-2 {
        width: 16.66%;
    }

.col-3 {
        width: 25%;
    }

.col-4 {
        width: 33.33%;
    }

.col-5 {
        width: 41.66%;
    }

.col-6 {
        width: 50%;
    }

.col-7 {
        width: 58.33%;
    }

.col-8 {
        width: 66.66%;
    }

.col-9 {
        width: 75%;
    }

.col-10 {
        width: 83.33%;
    }

.col-11 {
        width: 91.66%;
    }

.col-12 {
        width: 100%;
    }

@media only screen and (max-width: 650px) {
        /* For mobile phones: */
        [class*="col-"] {
            width: 100%;
        }
    }
</style>

<div class="header">
    <h1>TechFunda</h1>
</div>

<div class="col-3 menu">
        <ul>
            <li>Technologies</li>
            <li>Become Author</li>
            <li>Refer & Earn</li>
            <li>Get Knowledge</li>
        </ul>
    </div>

<div class="col-6">
        <h1>Free Tutorials</h1>
        <p>TechFunda is a free e Learning tutorial website abailable in the world wide web as, www.techfunda.com</p>
    </div>
    
    <div class="col-3 right">
        <div class="aside">
            <h2>Benifit?</h2>
            <p>We can learn the Technologies and we can earn the money easily.</p>
            <h2>How?</h2>
            <p>By submitting the technologies what ever we know.</p>
            <h2>Contact</h2>
            <p>You can reach us throus mail ID webmaster@techfunda.com</p>
        </div>
    </div>
</div>

<div class="footer">
    <p>Resize the browser window to see how the content respond to the resizing.</p>
</div>
</body>
</html>

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Adding Break Point By Using Media Query In CSS3.

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