.loader {
    border: 3px solid #fff;
    border-radius: 50%;
    margin: 5px;
}

.loader:nth-child(1) {
    animation: loader .8s  ease-in-out alternate infinite;
}

.loader:nth-child(2) {
    animation: loader .8s  ease-in-out alternate infinite;
}

.loader:nth-child(3) {
    animation: loader .8s  ease-in-out alternate infinite;
}

@keyframes loader {
    to {
        transform: scale(1.6);
    }
}