@media (max-width: 767px) {
    .mathvis {
        font-size: 25px; 
        margin-bottom: 4px; 
        margin-top: 4px;
    }
}

#bitcoinAddress {
    font-size: 14px;
}
#copyButton {
    background: transparent;
    border-color: transparent;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
}
#copyIcon {
    margin-right: 5px;
    margin-left: 5px;
}