body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}


.hlavicka {
    background-color: lightblue;
    text-align: center;
    padding: 15px;
}


.paticka {
    background-color: lightblue;
    text-align: center;
    padding: 10px;
    margin-top: 40px;
}


.uvod,
.Anotace {
    width: 80%;
    max-width: 900px;
    margin: 20px auto;
    border-top: 2px solid black;
    padding-top: 20px;
}


.uvod h3,
.Anotace h4 {
    text-align: center;
}


.uvod p,
.Anotace p {
    text-align: justify;
}


.klicova {
    text-align: center;
    font-style: italic;
}


.obrazek {
    display: block;
    margin: 20px auto;
    width: 80%;
    max-width: 600px;
    height: auto;
    border: 2px solid black;
}


nav ul {
    list-style-type: none;
    padding: 0;
    text-align: left;
}

nav li {
    margin: 5px 0;
}

nav a {
    color: blue;
}


hr {
    width: 80%;
    max-width: 900px;
    margin: 20px auto;
}
table {
    width: 80%;
    margin: 20px auto;
    border-collapse: collapse;
}

th, td {
    border: 1px solid black;
    padding: 10px;
    text-align: center;
}

th {
    background-color: lightblue;
}

table {
    width: 80%;
    margin: 20px auto;
    border-collapse: collapse;
}

th, td {
    border: 1px solid black;
    padding: 10px;
    text-align: center;
}

th {
    background-color: lightblue;
}