.mute-button {
    background-color: transparent;
    border: none;
    padding: 0px !important;
    cursor: pointer;
}

.mute-button img {
    width: 24px;
    height: 24px; 
}

@media screen and (max-width: 767px){
 .mute-button img {
    width: 18px;
    height: 18px;
}   
}