body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
div.container {
  max-width: 500px;
  min-height: 90vh;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
img.icon {
  flex: 1 1 auto;
  max-width: 200px;
  max-height: 200px;
}
div.option_container {
  width: 100%;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  margin: 4rem 0;
}
a.option {
  max-height: 32px;
  flex: 1 1 auto;
  text-align: center;
  background-color: white;
  padding: 0.8rem 2rem;
  margin: 0.5rem 4rem;
  color: dimgray;
  text-decoration: none;
  font-size: 1.5rem;
  border-radius: 4px;
  border-color: lightgray;
  border-width: 1px;
  border-style: solid;
}
@keyframes animate_to_hover {
  from {
  color: dimgray;
  border-color: lightgray;
  }
  to {
    color: #4A90E2;
    border-color: #4A90E2;
  }
}
a.option:hover {
  color: #4A90E2;
  border-color: #4A90E2;
  animation-name: animate_to_hover;
  animation-duration: 0.5s;
}
@media screen and (max-width: 400px) {
  img.icon {
    max-width: 150px;
    max-height: 150px;
  }
  div.option_container {
    margin: 2rem 0;
  }
  a.option {
    padding: 0.5rem 2rem;
    margin: 0.5rem 2rem;
    font-size: 1.2rem;
  }
}

a.icp, span.copyright {
  font-size: 0.8rem;
  color: gray;
  text-decoration: none;
}