Remove border on toggle button and 2D image

Hi,

I have a couple of items in the 2D border of my experience.  An image and a toggle switch.  The iamge background is transparent as set in the saved .png file and the toggle button has had it's background set to transparent in CSS as shown below.

//Button Class
.my-button {
font-family: Titillium Web;
color: red;
background-color: transparent;
}

However, I am still getting these grey lines appearing between elements in the experience.  Does anyone have any idea what they are and more importantly how to turn them off!

Thanks,

Sy