table, th, td {
    border: 1px solid #ddd;
    border-collapse: collapse;
    padding: 8px;
}
.ql-editor table {
    display: table;
    width: 60%;
} 
.ql-editor th {
    font-weight: bold;
}
.ql-editor table tbody tr:first-child td {
    font-weight: bold;
}