@media only screen and (max-width: 680px) {
  header {
    background-color: rgba(0, 0, 0, 0.9);
    position: fixed;
    top: unset;
    bottom: 0;
    padding-left: 2rem;
    left: -1.5rem;
    width: 100vw;
  }
}
.QA li {
  text-align: right;
}