I got bored and started looking for random bugs, here's what i found
Around a width of 700 pixels the scramble div stops being responsive but everything else keeps being responsive which makes it look like the screenshot below, this can be fixed with a simple width=100%, or lower to deal with the padding.
View attachment 35925
I was also able to put the cube in front of the timer at certain widths
View attachment 35926
Lastly, sometimes by dragging down from the top of the cube and moving your mouse all the way down to the 3d-2d button then releasing click, it will switch to 2d mode, then when you re-enable 3d mode, sometimes the 3d preview disappears.
View attachment 35927
I'd also like to see manual input and being able to add +2s, but that's just me. The site looks really cool for the rest and I love the dark mode and the delete button. The site is very intuitive. I'd certainly recommend this to people who just started cubing and don't wanna go trough the hassle of figuring out how to work with CStimer.