As I leave the background image transparent and responsive, responsive I got with the code below, but now I need to put transparency in the image.
CSS
body{
background: url(../img/bg.jpg) no-repeat center center fixed;
background-size: cover; /*Css padrão*/
-webkit-background-size: cover; /*Css safari e chrome*/
-moz-background-size: cover; /*Css firefox*/
-ms-background-size: cover; /*Css IE não use mer#^@%#*/
-o-background-size: cover; /*Css Opera*/
}
HTML
<html>
<head>
<title>ControlHall - Telve Tecnologia</title>
<link href="css/style.css" rel="stylesheet">
</head>
<body>
</body>
</html>