editor.css

.wp-block-skguten-stylesheets-block {
    color:green;
    background: #cfc;
    border: 2px solid #9c9;
    padding: 20px;
}

.plugin-sidebar-content {
    padding: 16px;
}

.rana-section-block {
    height: 200px;
    background-color: #c99;
}