html {
  background-image: url(obrazky/birds.png);
}

hr{
  background-color: black;
  color: black;
  height: 1px;
  margin-bottom: 50px;
  margin-top: 50px;
}

#main{
  background-color: blanchedalmond;
  max-width: 800px;
  border: 1px;
  border-style: solid;
  border-radius: 10px;
  padding: 10px;
  margin: 0 auto;
  overflow: auto;
}

.center{
  display: flex;
  justify-content: center;
  align-items: center;
}

header{
  background-color: beige;
  border: 1px;
  border-style: solid;
  border-radius: 10px;
  width: 800px;
  margin: 0 auto;
  margin-bottom: 1em;
  padding-left: 10px;
}

.menu {
  padding: 14px 16px;
  padding-left: 50px;
}

.menu a {
  display: inline;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  color: black;
}

.menu a:hover {
  background: #ddd;
  color: black;
}

footer{ 
  text-align: center;
}

li{
  padding: 3px;
}

table{
  border: 2px solid;
  border-collapse: collapse;  
}

td.bottom{
  border-bottom: double;
}

th{
  border-bottom-style: double;
  border-left: 1px solid;
  padding: 4px;
}

td{
  border: solid 1px;
  padding: 4px;
}