Using CSS and Javascript for customization
Last updated: August 28, 2025
Intro
Here you can find the most common HTML/CSS/JS customisations and snippets to use in your Videosync events.
Modifying only the appearance (CSS)
📌 What is CSS class or id?
A class is used in HTML like this:
In CSS, this class can be referred like this to change its font color, for example: .container { color: red; }
ID is basically the same, but with different syntax:
In CSS: #container { color: red; }
So in CSS, class uses dot (.) and id uses hashtag (#).
Access CSS editor in Videosync Admin: Advanced > Advanced Settings > CSS editor
How do I hide or show an element?
You can hide and show different elements by removing or adding display: none; in the CSS editor for the corresponding element id. You have to find out the name of the required element using the browser’s inspector or from the list below.
To show
-
Go to Advanced > Advanced settings > CSS editor
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(Ctrl+f) search for the right element, e.g. chat messages #chatboard-comments { display: none; }
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Remove display: none; To hide
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Go to Advanced > Advanced settings > CSS editor
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Add the following code #chatboard-comments { display: none; }
Element names
/* Names of the most common main elements in event page */
#vs-header { /* Top bar with the event title */ }
#vs-about-below-video { /* About section directly below video player */ }
#vs-about-section { /* Normal about section */ }
#vs-registration { /* Registration form area */ }
#vs-presentation { /* General video player & slide (& chat next to video) area*/ }
#vs-reactions { /* Emoji reactions below video player */ }
#vs-thumbnails { /* Slide thumbnails carousel below video & slide */ }
#vs-attachments { /* Attachments list */ }
#vs-hidden { /* Hidden state placeholder for the player/slide area. Usually contains text “Live is paused” etc. Applies to pre-live, paused and hidden-od states. */ }
#vs-messageboard { /* Chat / Messageboard either next to video player or below it as an own section */ }
#vs-links { /* Link grid */ }
#vs-chapters { /* Chapters list */ }
#vs-chapter-select { /* Chapter select dropdown in on-demands */ }
#vs-footer { /* Mainfooter */ }
#vs-videosync-footer { /* Videosync’s own small footer on the bottom with terms, privacy policy, copyright notice */ }
#vs-users-list { /* Participants list as a section on the page */ }
/* Notify the dev team (support@videosync.fi) if something should be added to this list */
I can’t find an element, for example “Speakers list” anywhere on the admin page. Where is it and how can I edit it?
It is most likely custom made HTML structure in the about section. Check it out and look for HTML tags containing the information you’re looking for:
Now, it’s easy to change the necessary information to what you want, e.g. Speaker Name -> Another Alias without touching the HTML code.
The styles related to this element can also be found by searching the .custom class name within the Advanced > Advanced settings > CSS editor:
.custom { color: red; }
How can I use a Google font
Add the following code to CSS editor
/* Inter as an example */ @import url(“https://fonts.googleapis.com/css2?family=Inter&display=swap”);
body { font-family: “Inter”, sans-serif; }
Changing the order of page elements
/* Add this to make the “order” rules work */ .vs-mainwrapper { display: flex; flex-direction: column; }
/* Add the rule “order: ” to all necessary elements followed by the respective number in which order you want them to be */ #vs-header { order: 0; }
#vs-about-section { order: 2; }
#vs-presentation { order: 1; }
Full width background image for the hidden text
Good size for a background image is 1980x1080
/* Hidden as an example */ #vs-hidden { background-size: cover; }
Adding new elements (HTML+CSS+JS)
📌 How to add different snippets to your Videosync event site?
- HTML can be added in their respective text fields (e.g. Event site setup > Event description area > Content)
- CSS code can be added in Advanced > Advanced Settings > CSS editor
- JavaScript code can be added in Advanced > Advanced Settings > Embed own JavaScript. Always include tags around the JS code.
Countdown to hidden state
HTML:
Tervetuloa!
CSS:
/* COUNTDOWN */
.welcome-text-hidden { display: flex; flex-direction: column; justify-content: center; opacity: 0.9; }
.welcome-text-hidden h3 { margin: 0; font-size: 24px; }
.welcome-text-hidden div { width: 300px; font-size: 16px; margin: 33px 12px 12px 0; line-height: 140%; }
.countdown-container { flex-wrap: wrap; display: flex; }
.countdown-container div { display: flex; flex-direction: column; justify-content: center; align-items: center; background: #0a121f; min-width: 100px; min-height: 108px; margin: 12px 12px 12px 0; opacity: 0.9; border-radius: 10px; }
.count-span { line-height: 1; margin-top: 14px; font-size: 14px; }
#days, #hours, #minutes, #seconds { font-weight: 700; font-size: 40px; }
JavaScript:
Topic list to About section
HTML:
- Topic 1
- Topic 2
- Topic 3
- Topic 4
- Topic 5
Looks like this:
- Topic 1
- Topic 2
- Topic 3
- Topic 4
- Topic 5
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