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

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

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

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

/* Styles for old versions of IE */
.btn-spinner {
    font-family: sans-serif;
    font-weight: 100; }

/* :not(:required) hides this rule from IE9 and below */
.btn-spinner:not(:required) {
    -webkit-animation: three-quarters 1250ms infinite linear;
    -moz-animation: three-quarters 1250ms infinite linear;
    -ms-animation: three-quarters 1250ms infinite linear;
    -o-animation: three-quarters 1250ms infinite linear;
    animation: three-quarters 1250ms infinite linear;
    border: 3px solid #8c8c8c;
    border-right-color: transparent;
    border-radius: 100%;
    box-sizing: border-box;
    display: inline-block;
    position: relative;
    vertical-align: middle;
    overflow: hidden;
    text-indent: -9999px;
    width: 18px;
    height: 18px; }

.btn-spinner:not(:required) {
    margin-left: -18px;
    opacity: 0;
    transition: 0.4s margin ease-out, 0.2s opacity ease-out; }

.is-loading .btn-spinner {
    transition: 0.2s margin ease-in, 0.4s opacity ease-in;
    margin-left: 5px;
    opacity: 1; }

.btn {
    text-align: left; }