Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
/* Turn the "Save page" button green if I'm logged in */
INPUT#wpSave
{
    background-color:#33CC00;
}

.editsection {
    float:none;
    display: block;
    text-align: right;
    position: relative;
    top: 0.67em;
    line-height: 0;
}