* { /* universal */
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Calibri';
}

body {
  height: 100%;
}

hr {
  margin-top: 10px;
  margin-bottom: 5px;
  border: 0;               
  height: 1px;
}

header {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid;
  border-bottom: 1px solid;
  padding: 10px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

.head {
  order: 2;
  padding: 5px;
  padding-right: 20px;
  padding-left: 24px;
  margin-right: 15px;
  font-weight: bold;
  font-size: 20px;
}

main {
  min-height: 630px;
  display: flex;
  justify-content: center;
  padding: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.left {
  display: flex;
  flex-direction: column;
  width: 100%;
  margin: 5px;
  padding: 0px;
}

.card {
  border: 1px solid;
  margin-bottom: 5px;
  min-height: 200px;
  border-radius: 5px; 
  padding: 10px;
  padding-top: 10px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

li {
  margin-left: 24px;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #121212;
    color: #eee;
  }

  a {
    color: #4B8BBE;
    text-decoration: none;
  }

  hr {
    background-color: #333333;
  }

  header {
    border-top: 1px solid #333333;
    border-bottom: 1px solid #333333;
  }

  a:hover {
    color: #FFFFFF; 
    text-decoration: underline; 
  }
  .card {
    border: 1px solid #333333;
    color: white;
  }
}

@media (prefers-color-scheme: light) {
  body {
    background: #fefefe;
    color: #111;
  }

  a {
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline; 
  }

  .card {
    background: #fff;
    color: #000;
  }
}