body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  --body-padding: 2rem;

  background:
    linear-gradient(0deg, rgba(0,0,0,.2), rgba(0,0,0,.05)),
    radial-gradient(at 20% 30%, rgb(80 173 255 / 10%), transparent 55%),
    radial-gradient(at 83% 10%, rgb(221 216 74 / 13%), transparent 60%),
    radial-gradient(at 10% 80%, rgb(176 249 40 / 6%), transparent 40%),
    radial-gradient(at 90% 80%, rgb(48 95 151 / 14%), transparent 55%),
    radial-gradient(at 50% 45%, rgb(255 125 61 / 20%), transparent 60%);
  width: calc(100vw - 2 * var(--body-padding));
  height: calc(100vh - 2 * var(--body-padding));
  padding: var(--body-padding);
}

html {
  --screen-break: 576px;
  --card-max-width: 450px;
}

.page-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: calc(100vh - 2 * var(--body-padding));
}

.card-container {
  /* transform: translateY(-50%); */
  width: min(100vw, var(--card-max-width));
  box-shadow: 0 3px 7px rgba(0,0,0,.2);
  padding: 1.5rem 1rem;
  margin-bottom: 10rem;

  /* should use whole space when screen < 450px */
}

#footer {
  --padding-h: 1rem;
  width: calc(100vw - 2 * var(--padding-h));
  padding: .3em var(--padding-h);
  font-size: .8rem;
  color: white;
  background-color: rgba(0,0,0,.4);
  bottom: 0;
  left: 0;
  position: fixed;
  display: flex;
  justify-content: end;
  column-gap: 1em;

  /* make footer transparact when screen-break, color to black */
}

#footer a:hover {
  text-decoration: underline;
}

@media only screen and (max-width: 576px) {
  body {
    --body-padding: 0px;
  }
}

.grecaptcha-badge {
  display: none;
}