Полезные коды для сайта- Белнет 24

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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html {
height: 100%;
margin: 0;
}

.bg {
/* The image used */
background-image: url("img_girl.jpg");

/* Full height */
height: 50%;

/* Center and scale the image nicely */
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
</style>
</head>
<body>

<div class="bg"></div>

<p>This example creates a half page background image. Try to resize the browser window to see how it always will cover 50% of the screen, and that it scales nicely on all screen sizes.</p>

</body>
</html>