@keyframes waiting {
     from {
         transform: rotate(0deg);
     }
     to {
         transform: rotate(360deg);
     }
 }

.ajax-form {

}

.ajax-form .ajax-saving {
    display: none;

    width: 1em;
    height: 1em;
    border: solid 2px #000000;
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-radius: 100%;
    vertical-align: middle;

    animation: waiting 1.2s infinite ease-in-out;
}

.ajax-form.waiting .ajax-saving {
    display: inline-block;
}