.lesson-content table {
   width: 100%;
}

.lesson-content table tr:nth-child(even) {
  background-color: #CCC;
}

.lesson-content table th {
  background-color: #507279;
  color: #FFF;
}
.lesson-content table td {
   text-align: center;
}
.lesson-content table a {
   text-decoration: underline;
}