Сделать резиновым фон страницы - Joomla 2.5: Шаблоны, разметка и макеты вывода

/* Basic elements */
::selection {background: #ffbf25; color: #fff}
::-moz-selection {background: #ffbf25; color: #fff}
::-webkit-selection {background: #ffbf25; color: #fff}
body{  line-height:1.8; color: #666; background: #ffbf25 url('../images/bg.jpg')  no-repeat center top;}
a { text-decoration: none; color: #333; -webkit-transition: color 0.15s linear; -moz-transition: color 0.15s linear; -o-transition: color 0.15s linear; transition: color 0.15s linear; }

@media screen and (max-width: 980px) {
background-image: url('../images/bg-middle.jpg')
}
@media screen and (max-width: 650px) {
background-image: url('../images/bg-mini.jpg')
}