html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: #ffffff;
  color: #0f172a;
}

body {
  margin: 2em auto;
  padding: 1em;
  box-sizing: border-box;
  width: 100%;
  max-width: 1280px;
}

header {
  text-align: center;
}

.logo {
  display: inline-block;
  background-image: url(../img/logo.png);
  background-size: 100%;
  width: 160px;
  height: 53.875px;
}

.column {
  width: 50%;
  padding: 0.75em;
  box-sizing: border-box;
  float: left;
}

.clearfix {
  display: table;
  clear: both;
}

h1 {
  font-size: 2.5em;
}

a {
  color: #ff4400;
}

@media screen and (max-width: 512px) {
  h1 {
    font-size: 2em;
  }

  .column {
    float: none;
    width: 100%;
    padding: 0;
  }
}

@media screen and (prefers-color-scheme: dark) {

  html,
  body {
    background-color: #0c0a09;
    color: #e1e7ef;
  }

  .logo {
    background-image: url(../img/logo-dark.png);
  }
}