.corners-top {
position: relative ;
width: 450px; min-height: 200px ;
background-color : #fff; /* Replis */
background:
-moz-linear-gradient(45deg, transparent 10px, #fff 10px),
-moz-linear-gradient(135deg, transparent 10px, #fff 10px),
-moz-linear-gradient(225deg, transparent 10px, #fff 10px),
-moz-linear-gradient(315deg, transparent 10px, #fff 10px);