Build with html, css and javascript, starting with the responsive site

The progress bar did not find a way to change the color, when using background I changed the color of the entire bar, I thought better use a div inside another and give it color, in the end, I did not use it. Do you open any way to change it? the color using progress ?. When selecting a radio input, I was looking for the way to select and deselect, which I did not find the way to do it, when using a checkbox it gave me that option but I got the error of not knowing how to circulate it. In the same way, on the desktop screen, when opening the modal, what are the prices, it was a bit difficult for me to accommodate them in the position, so I chose to use absolute and relative position. Is doing this a bad practice? Add the disable button until an amount is added, once the amount was added the button became enabled. I was trying to make pressing continue and reopen the modal, the input amount would be reset and the radio would be deselected, but I couldn't do it.