Holy_cow

I'm new to coding and trying to code my website, and my background image (and some other images that arent supposed to be selectable) are able to be highlighted, and dragged as if just pictures, what could the reason be?

My current css for the background is below, what do i have to add?

body{
background-color:#FFF;
background-image:url(images/background.png);
background:no-repeat;

}

.background{
left:0px;
top:0px;
}