.wp-block-separator {
    border: 0;
    height: 1px;
}

.wp-block-separator:not(.has-background) {
    background: #E2E2E2;
}

.wp-block-separator:not(.is-style-wide):not(.is-style-dots) {
    width: 8em;
    height: 2px;
}

.wp-block-separator.is-style-wide {
    width: 100%;
}