How to mute Audio when page loads

Hi my website is

https://www.misstraveljunkie.com

I have used Video Sidebar Widget and Im using Vimeo to play a couple of my videos. I want to know to do I keep the volume at mute when my website page loads us and if people want to hear the music they can manually increase the volume of the vimeo player.
SO i want the website page to load with the player at mute .

Thanks