.button-aligner {
  display: flex;
  justify-content: right;
  align-items: right;
}

button {
  border-radius: 0;
  margin: 0.1em;
}

button:hover {
  opacity: 0.6;
}

.audio-channel {
  display: flex;
  justify-content: right;
  align-items: center;
}
.audio-channel p {
  margin-right: 0.30em;
}

.button-aligner {
  display: flex;
  justify-content: flex-end;
}

button {
  border-radius: 0;
  margin: 0.1em;
}

button:hover {
  opacity: 0.6;
}

.audio-channel {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.audio-channel p {
  margin-right: 0.30em;
}

Fix buttons & source selection not being aligned right on some browsers
Fix buttons & source selection not being aligned right on some browsers
