.loader__element {
    border-radius: 100%;
    border: var(--size) solid var(--point-color);
    margin: calc(var(--size)*2);
}

.loader__element:nth-child(1) {
    animation: preloader .6s ease-in-out alternate infinite;
}
.loader__element:nth-child(2) {
    animation: preloader .6s ease-in-out alternate .2s infinite;
}

.loader__element:nth-child(3) {
    animation: preloader .6s ease-in-out alternate .4s infinite;
}

@keyframes preloader {
    100% { transform: scale(2); }
}