.infotech-net-bd-pay-bill-button {
    position: fixed;
    top: 50%;        
    left: 20px;
    transform: translateY(-50%) rotate(-90deg);
    transform-origin: left center;
    padding: 10px 10px;
    background-color: #f00;
    color: #fff;
    border-radius: 0 0 5px 5px;
    text-decoration: none;
    z-index: 2147483647;   /* max stacking order */
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
    width: auto;     
    min-width: 60px; 
    white-space: nowrap;
    cursor: pointer;
    pointer-events: auto; /* ensure it’s clickable */
}

.infotech-net-bd-pay-bill-button:hover {
    background-color: #ff0;
    color: #000;
    box-shadow: 5px 0 15px #ff0;
}