thủ thuật: Hiệu ứng xoay tròn 360 độ khi tải trang

@-moz-keyframes roll {
 100% { 
 -moz-transform: rotate(360deg); 
} 
} 

@-o-keyframes roll { 100% {
 -o-transform: rotate(360deg); 
} 
} 

@-webkit-keyframes roll { 100% {
 -webkit-transform: rotate(360deg); 
} 
} 

body{
 -moz-animation-name: roll;
 -moz-animation-duration: 2s;
 -moz-animation-iteration-count: 1;
 -o-animation-name: roll; -o-animation-duration: 2s;
 -o-animation-iteration-count: 2;
 -webkit-animation-name: roll;
 -webkit-animation-duration: 2s;
 -webkit-animation-iteration-count: 1;
 }