OpenSlides/openslides/assignment/static/styles/assignment.css

td.elected {
    background-color: #BED4DE !important;
}

td.elected a.election_link {
    background-image: url(../images/icons/voting-yes.png);
    background-repeat: no-repeat;
    background-position: center;
    width: 16px;
    height: 16px;
    display: block;
    margin-right: 5px;
    float: left;
}

td a.election_link {
    background-image: url(../images/icons/voting-yes-grey.png);
    background-repeat: no-repeat;
    background-position: center;
    width: 16px;
    height: 16px;
    display: block;
    margin-right: 5px;
    float: left;
}