.spin {
    -webkit-animation: spin 1.5s linear infinite;
    -moz-animation: spin 1.5s linear infinite;
    animation: spin 1.5s linear infinite;
}
@-moz-keyframes spin {
    100% {
        -moz-transform: rotate(360deg);
    }
}
@-webkit-keyframes spin {
    100% {
        -webkit-transform: rotate(360deg);
    }
}
@keyframes spin {
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
.fade {
  transition: opacity 0.05s linear;
}
optgroup{
  font-size: 16px;
}