moodle/grade/report/grader/styles.php

.grade-report-grader table#user-grades tr.marked td.cell {
    background-color: #FFCC99 ;
}

.grade-report-grader table#user-grades .catlevel1 {
  background-color: #ffffff;
}
.grade-report-grader table#user-grades .catlevel2 {
  background-color: #eeeeee;
}
.grade-report-grader table#user-grades .catlevel3 {
  background-color: #dddddd;
}

.grade-report-grader table#user-grades td.overridden {
  background-color: #dddddd;
}

.grade-report-grader table#user-grades tr.avg td.cell {
    background-color: #efefff;
}

.grade-report-grader table#user-grades tr.groupavg td.cell {
    background-color: #efffef;
}

.grade-report-grader table#user-grades tr.groupavg td.cell {
  font-weight: bold;
  color: #006400;
}

.grade-report-grader table#user-grades tr.avg td.cell {
  font-weight: bold;
  color: #00008B;
}

.grade-report-grader table#user-grades td.cat,
.grade-report-grader table#user-grades td.course {
  font-weight: bold;
}


.grade-report-grader table#user-grades {
  border-width:1px;
  border-style:solid;
  margin-top: 20px;
}

.grade-report-grader #overDiv table {
  margin: 0;  
}

.grade-report-grader #overDiv table td.feedback {
  border: 0px;
}
.grade-report-grader #overDiv .feedback {
  background-color: #AABBFF;
  color: #000000;
  font-family: Verdana;
  font-size: 70%;
  font-weight: normal;  
}

.grade-report-grader #overDiv .caption {
  background-color: #5566CC;
  color: #CCCCFF;
  font-family: Arial;
  font-size: 70%;
  font-weight: bold;
}

.grade-report-grader div.submit {
  margin-top: 20px;
  text-align: center;
}

.grade-report-grader table#user-grades td {
  border-width:1px;
  border-style:solid;
}

.grade-report-grader table#user-grades tr.heading {
  border-width:0px 0px 0px 0px;
  border-style:solid;
}

.grade-report-grader table#user-grades .heading td {
  border-width:0px 0px 0px 0px;
  border-style:solid;
}

.grade-report-grader table#user-grades th.category {
  border-width:1px 1px 0px 1px;
  border-style:solid;
}

.grade-report-grader table#user-grades th.user {
  border-width:0px 0px 1px 0px;
  border-style:solid;
}

.grade-report-grader table#user-grades th.categoryitem,
.grade-report-grader table#user-grades th.courseitem,
.grade-report-grader table#user-grades td.topleft {
  border-width:0px 1px 0px 1px;
  border-style:solid;
}

.grade-report-grader table#user-grades td.fillerfirst {
  border-width:0px 0px 0px 1px;
  border-style:solid;
}

.grade-report-grader table#user-grades td.fillerlast {
  border-width:0px 1px 0px 0px;
  border-style:solid;
}

.grade-report-grader table#user-grades th.item {
  border-width:1px 1px 1px 1px;
  border-style:solid;
}

.grade-report-grader div.gradertoggle {
  display: inline;
  margin-left: 20px;
}

.grade-report-grader table#user-grades {
  margin-left:auto;
  margin-right:auto;
}

.grade-report-grader table#user-grades  th.user {
  text-align:left;
}

.grade-report-grader table#user-grades  td {
  text-align:right;
}

.grade-report-grader table#user-grades th.range {
  border-width:1px 1px 1px 1px;
  border-style:solid;
}

.grade-report-grader table#user-grades .userpic {
  display: inline;
  margin-right: 10px;
}

.grade-report-grader table#user-grades .quickfeedback {
  border: #000000 1px dashed;
}

.grade-report-grader #siteconfiglink {
  text-align: right;
}

.grade-report-grader table#user-grades .hidden,
.grade-report-grader table#user-grades .hidden a {
  color:#aaaaaa;
}

.grade-report-grader table#user-grades .datesubmitted {
  font-size: 0.7em;
}

.grade-report-grader table#user-grades td.cell {
  padding-left: 5px;
  padding-right: 5px;
}