.acform-loading:after {
    content: "";
    width: 20px;
    height: 20px;
    border: 4px solid #FFF;
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin: 0 20px
}
@keyframes rotation { 0% { transform: rotate(0deg) } 100% { transform: rotate(360deg) } }