#bif-floating-button {
    position: fixed;
    z-index: 99990;
    display: block;
    line-height: 0;
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 24px);
}
#bif-floating-button a,
#bif-floating-button span {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
    box-shadow: none;
}
#bif-floating-button a {
    outline-offset: 3px;
}
#bif-floating-button img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border: 0;
    border-radius: 0;
    box-shadow: none;
}
@media (max-width: 600px) {
    #bif-floating-button {
        max-width: calc(100vw - 24px);
        max-height: 22vh;
    }
    #bif-floating-button img {
        max-width: 100%;
        max-height: 22vh;
    }
}