Fixed Background with CSS3 Demonstrations

Some of the CSS code is shown...

body{ background-image: href="../img/0021-qpr.jpg"; background-attachment: fixed; background-size: cover; }

h2,header h1{ text-align:center; color:#F5F8FF ; text-shadow: 1px 1px 1px #4300A8; }

border: solid #000000 2px; border-radius: 15px; background-image: linear-gradient(to right, #0060BF, #B2E3FF);

position: relative; width: 80%; top: 30px; border: solid #FFFFFF 3px; border-radius: 5px ;

position:static; background-color: rgba(204, 0, 0, .5);
position:relative; display:inline-block; background-color: rgba(0, 0, 255, 0.5);
position:relative; display:inline-block; background-color: rgba(216, 217, 122, 0.5);
position: relative; display:block; background-color: rgba(0, 0, 255, 0.8);
position:absolute; background-color: rgba(0, 128, 128, .7); left:50% ; top:50px;