fieldset {
    margin: 10px 0px;
    font-family: "Montserrat", "sans-serif"; /* just a custom font */
    width: 30em;                            /* fixed width for the box */
    border-radius: 0.5em;                   /* applied border radius */
    border: 0.1em solid #ccc;               /* custom border style */
    background-color: #fffde1;              /* added a background color */
    box-shadow: 0.08em 0.05em 0.08em #ccc;  /* added a soft box shadow */
}

fieldset > legend {
    margin: 5px 0px;
    margin-top: -15px;
    background-color: white;
    width: 240px;
    font-size: 13px;
}

#section_configuration_intercalated > legend{
    width: 200px;
}