:root {
  color-scheme: dark light;
  font-family: system-ui, sans-serif;
}

html {
  display: flex;
  flex-direction: column;
  align-items: center;
}

body {
  width: 600px;
  max-width: calc(100% - 1rem);
  padding: .5rem;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: black;
  }
}

h1,
h2 {
  color: darkblue;
  background-color: white;
}

@media (prefers-color-scheme: dark) {
  h1,
  h2 {
    color: yellow;
    background-color: black;
    padding-block: 0.5rem;        
  }
}

h1 {
  font-size: 1.2rem;
  z-index: 2;
}

h1 > img {
  height: 1.25rem;
  width: auto;
  vertical-align: middle;
}

h2 {
  font-size: 1.1rem;
  position: sticky;
  top: 2rem;
  z-index: 1;
}

a {
  color: red;
}

a:after {
  width: 12px;
  height: 12px;
  content: "";
  display: inline-block;
  margin-inline-start: 0.25rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' version='1.0' width='12' height='12'%3E%3Cpath fill='%23fff' stroke='%2306c' d='M1.5 4.5h6v6h-6z'/%3E%3Cpath d='M4 2.5l1 1 .25.75-2.5 2.25L5.5 9.25l2.25-2.5.75.25 1 1L11 6.5V1H5.5L4 2.5z' fill='%2306f' fill-rule='evenodd'/%3E%3Cpath d='M6 2h4v4l-.5.75-1.25-2-3 3.25L4 6.75l3.25-3-2-1.25L6 2z' fill='%23fff' fill-rule='evenodd'/%3E%3C/svg%3E");
}

header {
  position: sticky;
  top: 0;
  z-index: 2;
}

header,
div,
form,
li {
  margin-block-end: 1rem;
}

button {
  display: inline-block;
  border: none;
  padding: 1rem 2rem;
  margin: 0;
  text-decoration: none;
  background: #0069ed;
  color: #ffffff;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  text-align: center;
  transition: background 250ms ease-in-out, transform 150ms ease;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

button:hover,
button:focus {
  background: #0053ba;
}

button:focus {
  outline: 1px solid #fff;
  outline-offset: -4px;
}

button:active {
  transform: scale(0.99);
}

button[disabled] {
  cursor: progress;
  color: gray;
}

ul {
  list-style: none;
  padding-inline-start: 0;
}

li {
  padding: 0.25rem;
}

li {
  background-color: rgba(0 0 0 / 0.1);
}

@media (prefers-color-scheme: dark) {
  li {
    background-color: rgba(0 0 0 / 0.9);
  }
}

.latitude,
.longitude {
  font-variant-numeric: tabular-nums;
}

.map {
  display: block;
  width: 100%;
  height: auto;
}

.position.offline:after {
  content: "(Offline)";  
}

.position.offline {
  cursor: not-allowed;
}