Generally, accordions are used with collapsible and toggling behavior. But this example shows you the combination of color schemes such as primary, success, danger, etc. The snippet is using the container for the responsive behavior of this design, the panel-group class is used which includes the panel-heading, panel-title, panel-body. You could also include the panel-footer if needed. The panel-default describes the color scheme for the accordion. Panel container different classes for color such as panel-primary, panel-success, etc. This is defined for each panel in panel-group. Each panel defines the buttons for previous and next accordion to open. Button click functions are taken care of by the javascript file. The CCS just defines the top-margin for the accordion, color scheme and fonts is taken care using the tags used in HTML. You can use these types of the accordion to display some new or important announcements on webpages.

This is a simple snippet using HTML tags. Though it looks like an accordion it is much more. It is a plain HTML details tag which specifies the additional details that the user can use and hide on demand. Unlink accordion, it is not collapsible unless it is clicked. This snippet can be used on any website to show the small amount of information for a particular section. Take a look at CSS, each tag is styled. The hovering function is used for the summary, once you hover the mouse on summary the styling is set for the borders of summary tag, along with the colours set for the details and summary in open state. The styling would enhance these simple tags and gives it look as collapsible or accordion. This can be used in your website easily to enhance your paragraphs.

This snippet shows examples of Accordion and toggles using Velocity.js. Velocity.js is an animation engine for the UI, which works with or without JQuery. It is fast it features colour animation, transforms, loops, easings, SVG support, and scrolling. It can be used instead of Jquery and CSS. Here, the snippet deals with bootstrap 3 combined with Velocity.js v1.2. You can see the Accordion and Toggle behaviour created using bootstrap classes. The HTML is similar for both the example, take a look at the CSS and JQuery. Jquery uses the Velocity for creating the animation effect for fading the panels once clicked to see the accordion and toggling behaviour. The animations are smoothly done. This would be used in websites with large content. You can use this code with your personal tweak to blend with your page.

https://codepen.io/tofanelli/pen/waadRY

This is a beautiful yet simple accordion created using Bootstrap 4. Your browser must support ES 6 in order to display this properly. You can see the accordion has a white background around the text. If you closely look at the code you can see, HTML code is simple and repetitive while CSS is very minimal. The biggest challenge is to write JavaScript code properly. One of the most noticeable code segment is the use of async and await. This accordion can be used on any website as a vertical navigation bar. You can expand the accordion by only by clicking the texts such as React. Accordion won’t be expanded if you click outside of the text within an accordion item. With slight modification to javascript, you can customize the accordion to behave in quite different ways.