editor.js/plugins/paragraph/paragraph.css

/**
* Empty paragraph placeholder
*/

.ce-paragraph {
    padding: 0.7em 0 !important;
    line-height: 1.7em;
}
.ce-paragraph:empty::before,
.ce-paragraph p:empty::before{
    content : attr(data-placeholder);
    color: #818BA1;
    opacity: .7;
    transition: opacity 200ms ease;
}
.ce-paragraph:focus::before{
	opacity: .1;
}


.ce-paragraph p {
    margin: 1.2em 0;
}
.ce-paragraph p:first-of-type{
    margin-top: 0;
}
.ce-paragraph p:last-of-type{
    margin-bottom: 0;
}