Hi Lana,
To center the main logo on the WebLink welcome page you can add this to the bottom of the file C:\Program Files\Laserfiche\WebLink\Web Files\WebLinkStyles.css:
.TopBar {text-align: center;}
#WelcomeIcon {position: static;}
To horizontally center the welcome banner background relative to the page content is a little more complicated:
#WelcomePageMainContent div[class^="WelcomePageBanner"] {
left: 50%;
transform: translate(-50%,0);
}
To center the welcome banner background relative to the page content (both directions):
#WelcomePageMainContent div[class^="WelcomePageBanner"] {
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
And to center it relative to the screen (so it stays centered like a watermark even if the Welcome page foreground content scrolls), add the position: fixed value:
#WelcomePageMainContent div[class^="WelcomePageBanner"] {
position: fixed;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
This might not work on some older browsers, should work on at least IE 11+ and Firefox/Chrome.
Hope this helps!