.sound-button {
    position: absolute;
    background-color: transparent;
    border: 0;
    margin: 0;
    padding: 0;
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 999;
}