.monocheckout-wrapper {
    margin:16px 0;
}
.monocheckout-wrapper a {
    display:inline-block;
    position:relative;
    line-height:0;
}
.monocheckout-wrapper a.loading::before {
    content: attr(data-loading-phrase);
    top:0;
    left:0;
    position: absolute;
    width:100%;
    height:100%;
    background:#000c;
    text-align: center;
    color:#fff;
    padding:5px;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    border-radius: 7px;
}