body {
    font-family: Arial, Helvetica, sans-serif;
    background: lavender;
}

h1 {
    display: block;
    font-size: 2em;
    margin-block-start: 0.67em;
    margin-block-end: 0.67em;
    margin-inline-start: 0px;
    margin-inline-end: 0px;
    font-weight: bold;
}

.h1 {
    float: left;
    color: #00A0E6;
}

.cabezal{
    background: #00A0E6;
    height: 60px;
    width: 100%;
    position: fixed;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

li {
    float: left;
}

.menu_item {
    display: block;
    text-align: center;
    padding: 22px 20px 22px 20px;
    color: #ffffff;
    text-decoration: none;
}

a:active {
    color: #00A0E6;
}

li a:hover {
    background: #098BC7;
}

.inicio {
    text-align: center;
}

.nivel1_contenedor {
    text-align: center;
}

.contenido_tabla {
    display: inline-block;
    width: 90%;
    margin-top: 80px;
}

.nivel1_tabla {
    width: 100%;
    border: 1px solid black;
}

.nivel1_th {
    height: 50px;
    border: 1px solid black;
    vertical-align: middle;
    text-transform: uppercase;
    font-size: 13px;
}

.nivel1_td {
    height: 30px;
    border: 1px solid black;
    vertical-align: middle;
    text-transform: uppercase;
    font-size: 13px;
}

.nivel1_tr {
    background: #ffffff;
}

.nivel1_tr:nth-child(even){
    background: #E5E1E1;
}

.nivel1_tr:hover {
    background: #DDDADA;
}

.nivel1_thead {
    background: gray;
}

.img_inicio {
    width: 80%;
    margin-top: 100px;
}