body, html
{
    /*background: url(/Images/Theme/background-default.jpg) transparent no-repeat;
    background-attachment: fixed;
	background-size:cover;*/
}
.boxRoundExercises, .boxRoundExercises2,.tree li a:hover,.folderS {background: rgba(255,255,255,0.5);}
.back {
    background-image: url(/Images/Theme/background-default.jpg);
    background-size: cover;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    position: fixed;
    z-index: -1;
}