vikunja-frontend/src/styles/theme/update-notification.scss

.update-notification {
  margin: 1em;
  display: flex;
  align-items: center;
  background: $warning;
  padding: 0 0 0 .5em;
  border-radius: $radius;
  font-size: .9em;
  color: darken($dark, 5);
  justify-content: space-between;

  @media screen and (max-width: $desktop) {
    & {
      position: fixed;
      bottom: 1em;
      margin: 0;
      width: 450px;
      left: calc(50vw - 225px);
    }
  }

  @media screen and (max-width: $tablet) {
    & {
      position: fixed;
      left: 1em;
      right: 1em;
      bottom: 1em;
      width: auto;
    }
  }

  p {
    text-align: center;
    width: 100%;
  }

  .button {
    margin-left: .5em;
  }
}