html {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0; 
    padding: 0; 
    height: 100%; 
    overflow: hidden;
}

.centre_box {
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.big_button {
    font-size: 20px;
}

#playback_window {
    position: absolute;
    left: 0; 
    right: 0; 
    bottom: 0; 
    top: 0;
}

#song_mgmt {
    display: flex;
    margin-top: 10px;
}

.mgmtChild {
    flex: 1;
    border: 2px solid black;
    padding: 5px;
    height: 300px;
    overflow-y: scroll;
}

.mgmtChild:first-child {
    margin-right: 20px;
} 

.song {
    border: 2px solid black;
    margin-top:5px;
    padding: 3px;
    font-size: 18;
}