body {
  background-color: #f9f9ff;
}
.center {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    -webkit-animation: spin1 2s infinite linear;
    -moz-animation: spin1 2s infinite linear;
    -o-animation: spin1 2s infinite linear;
    -ms-animation: spin1 2s infinite linear;
    animation: spin1 2s infinite linear;
}

@-webkit-keyframes spin1 {
0% { -webkit-transform: rotate(0deg);}
100% { -webkit-transform: rotate(360deg);}
}
@-moz-keyframes spin1 {
0% { -moz-transform: rotate(0deg);}
100% { -moz-transform: rotate(360deg);}
}
@-o-keyframes spin1 {
0% { -o-transform: rotate(0deg);}
100% { -o-transform: rotate(360deg);}
}
@-ms-keyframes spin1 {
0% { -ms-transform: rotate(0deg);}
100% { -ms-transform: rotate(360deg);}
}
@-keyframes spin1 {
0% { transform: rotate(0deg);}
100% { transform: rotate(360deg);}
}