.loading {
    background-image: url("../images/logo-efficy-mini.png");
    background-repeat: no-repeat;
    animation: fade 1s linear infinite;
    position: relative;
    width: 120px;
    height: 120px;
    margin-top: 25%;
    margin-left: 50%;
}


@keyframes fade {
    from  { opacity: 0; }
    to { opacity: 1; }
}