df_style.css

.mystyle table {
    border-collapse: collapse;
    width: 100%;
}

.mystyle {
    font-size: 11pt; 
    font-family: Arial;
    border-collapse: collapse; 
    border: 1px solid silver;

}

#mystyle table th,
#mystyle table td {
    border: 1px solid black;
    padding: 8px;
}

/* Basic font */
.mystyle body {
    font-family: Arial, sans-serif;
    font-size: 14px;
}