.muteBtn {
    position: absolute;
    bottom: 10px;
    left: 25px;
}

.muteBtn .mute-img {
    display: block;
}

.muteBtn .unMute-img {
    display: none;
}

.muteBtn.mute .mute-img {
    display: none;
}

.muteBtn.mute .unMute-img {
    display: block;
}

@media (min-width: 768px) {
    .muteBtn {
        bottom: 40px;
    }
}