finlabsindia/newSite/wp-content/plugins/newsletter/css/wp-editor.css

/* The CSS used for the WP editor on administration panels */
body {
    font-size: 16px;
    font-family: sans-serif;
    margin: 20px;
}

.mce-content-body p, table, ul, ol {
    margin-bottom: 15px;
    width: 650px;
    line-height: 24px;
}

img {
    max-width: 100%;
}