.wp-block-separator.is-style-dots {
    border: 1px dashed #fff !important;
    border-bottom: none !important;
    border-right: none !important;
    border-left: none !important;
    height: 0;
    border-radius: 0;
    padding: 0;
}

.wp-block-separator.is-style-dots::before {
    display: none;
}