Also,
If you want to add a border and a on-mouse-hover version =>
As always: change the colors (#xxxxxx) and list1 by the id of your block
The code below is only for the save/right button but the logic is exactly the same for the cancel/left button (:nth-child(1)
)
#list1 .MuiDialogActions-root .MuiButtonBase-root:nth-child(2) {
background-color: #000000 !important;
color: #FFFFFF !important;
border: 2px solid #000000 !important; /* 2px is the size of the border. 1px for a thiner border */
}
#list1 .MuiDialogActions-root .MuiButtonBase-root:nth-child(2):hover {
background-color: #FFFFFF !important;
color: #000000 !important;
border: 1px solid #000000 !important;
}