Hello,
1) Added the below code to Theme Options > Custom CSS. Check now
div.quantity ~ .et-or-wrapper {
display: inline-block;
flex: 1;
min-width: 120px;
margin: 0 10px !important;
align-items: center;
}
.et-single-buy-now.single_add_to_cart_button.button {
min-width: 145px;
}
2) a) To change the green bg edit the column bg image https://prnt.sc/18q65cf
b) To change the top space edit the margin of the column with the text https://prnt.sc/18q6fq0
Regards