.class-group, .grade-group {
    margin-bottom: 20px;
    border: 1px solid lightgray;
    padding: 10px;
}

.class-group h2, .grade-group h2 {
    border-bottom: 2px solid whitesmoke;
    padding-bottom: 5px;
    margin-bottom: 10px;
}

.student-list {
    list-style-type: none;
    padding-left: 10px;
}

.student-list li {
    margin-bottom: 5px;
}