Sometimes changes made to a website don’t register immediately due to caching. A hard refresh can usually fix this.
Chrome on Windows
Hold down Control [Ctrl] and click the Reload button.
Or hold down Ctrl and press F5.
Or open Chrome Dev Tools by pressing F12. Once they're open, right click on the refresh button and a menu will drop down. From this menu you can do a hard refresh and/or clear the cache.
Chrome on Mac
Hold Shift and click the Reload button or hold down ⌘ Command and Shift and then press R.
Mozilla Firefox on Windows
Hold Ctrl and press F5 or hold down Ctrl and Shift and then press R.
Mozilla Firefox on Mac
Hold down Shift and click the Reload button or hold down ⌘ Command and Shift and then press R.
Internet Explorer
Hold Ctrl and press F5 or hold Ctrl and click the Refresh button.