me too having this issue. i used this code but now its not working
.wc_quick_buy_button {
!important;
background-color: #ff7902;
height: 46px;
width: 100%;
margin-left: auto;
margin-right: auto;
display: block;
border: none;
border-radius: 3px;
color: white;
font-weight: bold;
}
