moodle/grade/report/grader/styles.css

.gradeparent {
    position: relative;
}

.gradeparent .grader-information-tooltip {
    min-width: 200px;
}

.gradeparent .graderreportoverlay {
    background-color: white;
    width: auto;
    padding: 10px;
    border-color: #ddd;
    font-size: 12px;
    box-shadow: #999999 2px 2px 3px;
    border-radius: 4px;
}

.gradebook-header-cell,
.gradeparent table th {
    font-size: 14px;
    font-weight: normal;
    padding: 4px 5px 4px 5px;
    border: 0 solid #ddd;
    border-left-width: 1px;
    border-top-width: 1px;
}

/* General table properties */
.gradeparent table td,
.gradeparent table th,
.gradeparent .cell,
.gradebook-footer-cell,
.gradebook-user-cell {
    padding: 4px 5px;
    vertical-align: middle;
}

/* Grade Item titles */
.gradebook-header-cell,
.gradebook-header-cell,
#gradebook-user-header-container,
.gradeparent tr.heading th.item,
.gradeparent tr.heading th.courseitem,
.gradeparent tr.heading th.userfield,
#studentheader {
    white-space: nowrap;
    background-color: #333;
}

.gradeparent .gradebook-header-cell.item,
.gradeparent .gradebook-header-cell.item a,
.gradeparent .gradebook-header-cell.courseitem,
.gradeparent .gradebook-header-cell.courseitem a,
.gradeparent .gradebook-header-cell.userfield,
.gradeparent .gradebook-header-cell.userfield a,
.gradeparent #gradebook-user-header-container,
.gradeparent #gradebook-user-header-container a,
.gradeparent .gradebook-user-cell,
.gradeparent .gradebook-user-cell a,
.gradeparent tr.heading th.item,
.gradeparent tr.heading th.item a,
.gradeparent tr.heading th.courseitem,
.gradeparent tr.heading th.courseitem a,
.gradeparent tr.heading th.userfield,
.gradeparent tr.heading th.userfield a,
.gradeparent th a,
.gradeparent #studentheader a {
    color: #fff;
}

/* The username cells */
.gradebook-user-cell {
    border-width: 1px 0 0 1px;
    border-style: solid;
}

.gradebook-user-cell,
.gradeparent th.user {
    padding: 4px;
    min-width: 200px;
    width: 200px;
    border-color: #666666;
    border-right-width: 1px;
    border-left: none;
    background-color: #333;
    color: #ddd;
}

.gradebook-user-cell:nth-child(odd),
.gradeparent tr:nth-child(odd) th.user {
    background-color: #777;
}

.gradebook-user-cell:nth-child(even),
.gradeparent tr:nth-child(even) th.user {
    background-color: #5c5c5c;
}

.gradebook-user-cell .userpicture,
.gradeparent th.user .userpicture {
    margin-right: 4px;
    border-radius: 50px;
    border: none;
    vertical-align: top;
}

/* The top-left user header cell */
#gradebook-user-header-container,
#studentheader {
    padding: 4px 5px;
    border-top: 1px solid #ddd;
}

#studentheader {
    border-left: none;
}

/* The footer row */
.gradebook-footer-cell,
.gradeparent .gradevalue,
.gradeparent .avg .cell {
    text-align: center;
    width: 100%;
}

.gradeparent .gradevalue {
    display: inline-block;
}

.gradeparent table#user-grades tr.avg th,
.gradeparent table#user-grades tr.avg td,
.gradebook-footer-cell {
    padding: 8px;
    background-color: #333;
    color: white;
    font-weight: bold;
    text-align: center;
    border: 1px solid #444;
    border-right: 0;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

#gradebook-footer-container.gradebook-footer-row-sticky {
    background-color: #444;
    display: block;
    border-bottom: 0px solid #444;
}

.gradebook-footer-cell:first-child,
.gradeparent table#user-grades tr.avg th.range {
    text-align: right;
}

/** MDL-46812 **/
#page-grade-report-grader-index.jsenabled .right_scroller.topscroll {
    background-color: #ececec;
    height: 20px;
    margin: 0;
    padding: 0;
}
#page-grade-report-grader-index.jsenabled .topscrollcontent {
    background-color: #ececec;
    height: 20px;
}
.jsenabled.path-grade-report-grader .left_scroller {
    border-top: 20px solid #ececec;
}