h1, h2, h3 {
    color: dodgerblue;
}

table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
  }
img {
    border: 1px solid black;
    margin: 0.2em;
    margin-top: 1em;
    margin-bottom: 1em;
}

ol, ul {
    line-height: 150%;
}

#merke {
    display: table;
    padding: 10px;
    margin: 0.2em;
    background: #ffa0a0;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 5px;
    font-size: 16px;
    font-family: Georgia, 'Times New Roman', serif;
}


 #hinweis {
    display: table;
    padding: 10px;
    margin: 0.2em;
    background: #adfb95;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 5px;
    font-size: 16px;
    font-family: Georgia, 'Times New Roman', serif;
}

#aufgabe {
    display: table;
    padding: 10px;
    margin: 0.2em;
    background: #fdfda5;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 5px;
    font-size: 16px;
    font-family: Georgia, 'Times New Roman', serif;
 }

 .aufgabe {
    display: table;
    padding: 10px;
    margin: 0.2em;
    background: #fdfda5;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 5px;
    font-size: 16px;
    font-family: Georgia, 'Times New Roman', serif;
 }

 .hinweis {
    display: table;
    padding: 10px;
    margin: 0.2em;
    background: #adfb95;
    color: #000000;
    border: 2px solid #000000;
    border-radius: 5px;
    font-size: 16px;
    font-family: Georgia, 'Times New Roman', serif;
}

details{
    margin-bottom:0;
    border:none;
    text-decoration: none;

}

details[open] summary {
    border-bottom:none;
}

summary {
    text-decoration: none;
}