.body2 {
    margin: 0;
    color: #ddd;
    font-family: sans-serif;
    background-color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    /* Asegura que el body ocupe toda la altura de la ventana */
    margin: 0;
    /* Quita el margen por defecto */
}

.h1principal {
    margin: 10px 20px 0 20px;
    /* max-width: 60dvw; */
    text-align: center;
    padding-top: 20px;
    padding-bottom: 20px;
    box-sizing: border-box;
    border: 1px solid #666;
    border-radius: 10px;
    align-content: center;
    font-size: 22px;
    color: #ddd;
}
.h2principal {
    margin: 10px 20px;
    /* max-width: 60dvw; */
    text-align: center;
    padding: 15px;
    box-sizing: border-box;
    border: 1px solid #666;
    border-radius: 10px;
    align-content: center;
    color: #ddd;
    font-size: 18px;
}

form {
    background-color: transparent;
    padding: 10px 20px;
    max-width: 500px;
    margin: auto;
    box-shadow: 0 0 35px #fff2;
    margin-top: 10px;
    border-radius: 8px;
}

input,
button,
select {
    width: 100%;
    box-sizing: border-box;
    padding: 6px 8px;
    border: none;
    border: 1px solid #666;
    box-shadow: 0 0 15px #0001;
    background-color: transparent;
    border-radius: 4px;
    color: #ddd;
    margin: 6px;
}

fieldset {
    margin: 20px 0;
    border: 1px solid #6666;
    border-radius: 5px;
}

legend {
    padding: 0 6px;
    /* si saco los 3 renglones que siguen cambia un poco*/
    border: 1px solid #ddd6;
    background-color: #ddd6;
    color: #222;
}