body {
    background-color: #eeeeee;
    text-align: justify;
}
header {
    padding: 10px;
    text-align: center;
}

h1 {
    font-family: Roboto;
    font-size: 32px;
    color: #000000;
    text-align: center; 
    margin-top: 4px;
}
p {
    font-family: Roboto, sans-serif;
    font-size: 18px;
    margin-left: 10px;
    margin-right: 10px;
}
h2 {
    font-family: Roboto;
}
h3 {
    font-family: Roboto;
}
h4 {
    font-family: Roboto;
}
h5 {
    font-family: Roboto;
}
h6 {
    font-family: Roboto;
}
ul {
    font-family: Roboto;
}
div {
    font-family: Roboto;
}
tr {
    font-family: Roboto;
}

.topnav {
    font-family: Roboto;
    overflow: hidden;
    background-color: #333;
    border-radius: 10px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
    margin: 10px 0;
}
.topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 10px 14px;
    text-decoration: none;
    transition: background-color 0.3s, color 0.3s;
    border-radius: 10px;
    margin: 4px;
}
.topnav a:hover {
    background-color: #ddd;
    color: black;
}
.topnav a.active {
    background-color: #1c77ff;
    color: white;
}

.topnav-right {
    float: right;
    display: flex;
    align-items: center;
}
.topnav-right a {
    float: none;
}
.topnav-right a:hover {
    background-color: #ddd;
    color: black;
}
.topnav-right select {
    padding: 6px 8px;
    font-size: 14px;
    border-radius: 10px;
    margin: 4px;
    background-color: #333;
    color: #f2f2f2;
    border: none;
    cursor: pointer;
}
.texto {
    margin-left: 5%;
    margin-right: 5%;
    text-align: justify;
}

.indice {
    background-color: #bbbbbb;
    padding: 20px;
    border-radius: 6px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin-top: 10px;
    font-size: 1.25em;
}
.indice ul {
    list-style-type: none;
    padding: 0;
}

@media (max-width: 600px) {
    h1 {
        font-size: 28px;
    }
    p {
        font-size: 16px;
    }
    .topnav a {
        padding: 6px 8px;
        font-size: 14px;
    }
    .topnav-right {
        float: left;
    }
}