moodle/theme/base/style/message.css

/** Message **/
.message-discussion-noframes h1 {
    font-size: 1em;
}

.message-discussion-noframes #userinfo .commands {
    font-size: 0.8em;
}

.message .noframesjslink {
    font-size: 0.8em;
}

.message .link {
    font-size: 0.8em;
}

.message .heading {
    font-size: 1.0em;
    font-weight: bold;
    clear: both;
}

.message .author {
    font-weight: bold;
}

.message .time {
    font-style: italic;
}

#page-message-user .commands span {
    font-size: 0.7em;
}

#page-message-user .name {
    font-weight: bold;
    font-size: 1.1em;
}

table.message_search_results td {
    border-color: #DDDDDD;
}

.message .time {
    color: #999999;
}

.message.me .author {
    color: #999999;
}

.message.other .author {
    color: #8888CC;
}

#page-message-messages {
    padding: 10px;
}

#page-message-send .notifysuccess {
    padding: 1px;
}

#page-message-send td.fixeditor {
    text-align: center;
}

.message .note {
    padding: 10px;
}

table.message .searchresults td {
    padding: 5px;
}

.message .contactselector {
    width: 24%;
    float: left;
}

.dir-rtl .message .contactselector {
    float: right;
}

.message .contactselector .paging {
    z-index: 1;
    position: relative;
}

.message .message-contacts {
    list-style-type: none;
    margin: 0;
}

.message .message-contacts li {
    clear: both;
    position: relative;
}

.message .message-contacts li .pix {
    left: 0;
    position: absolute;
}

.dir-rtl .message .message-contacts li .pix {
    left: auto;
    right: 0;
}

.message .message-contacts li .contact {
    margin: 0 24% 0 25px;
    text-align: left;
}

.dir-rtl .message .message-contacts li .contact {
    text-align: right;
    margin: 0 25px 0 24%;
}

.message .message-contacts li .contact.nolinks {
    margin-right: 5px;
}

.dir-rtl .message .message-contacts li .contact.nolinks {
    margin-left: 5px;
    margin-right: 25px;
}

.message .message-contacts li .link {
    float: right;
    max-width: 30%;
}

.dir-rtl .message .message-contacts li .link {
    float: left;
}

.message .messagearea {
    padding-left: 1%;
    border-left: 1px solid LightGrey;
    width: 74%;
    float: right;
    min-height: 200px;
}

.message .messagearea .messagehistorytype {
    clear: both;
    padding-bottom: 20px;
}

.message .messagearea .messagehistory .user {
    vertical-align: top;
    width: 32%;
    min-width: 100px;
    float: left;
}

.message .messagearea .messagehistory .user:first-child {
    margin-left: 13%;
}

.message .messagearea .messagehistory .user:last-child {
    margin-right: 13%;
}

.dir-rtl .message .messagearea .messagehistory .user:first-child {
    margin-right: 13%;
    margin-left: 0;
}

.dir-rtl .message .messagearea .messagehistory .user:last-child {
    margin-left: 13%;
    margin-right: 0;
}

.message .messagearea .messagehistory .user > div {
    text-align: center;
    border: none;
}

.message .messagearea .messagehistory .between {
    float: left;
    width: 16px;
    margin: 0 3%;
    padding-top: 40px;
}

.dir-rtl .message .messagearea .messagehistory .between,
.dir-rtl .message .messagearea .messagehistory .user {
    float: right;
}

.message .messagearea .messagehistory .heading,
.message .messagearea .messagehistory h3 {
    width: 100%;
    clear: both;
}

.message .messagearea .messagehistory .left {
    position: relative;
    margin-bottom: 10px;
    width: 50%;
    float: left;
    clear: both;
}

.dir-rtl .message .messagearea .messagehistory .left {
    float: right;
}

.message .messagearea .messagehistory .right {
    position: relative;
    margin-bottom: 10px;
    width: 50%;
    float: right;
    clear: both;
}

.dir-rtl .message .messagearea .messagehistory .right {
    float: left;
}

.dir-ltr .message .messagearea .messagehistory .message {
    margin-right: 20px;
}

.dir-ltr .message .messagearea .messagehistory .right .message {
    margin-left: 20px;
}

.dir-rtl .message .messagearea .messagehistory .message {
    margin-left: 20px;
}

.dir-rtl .message .messagearea .messagehistory .right .message {
    margin-right: 20px;
}

.message .messagearea .messagehistory .messageactive {
    background-color: #F5F5F5;
}

.message .messagearea .messagehistory .messagecontent .deleteicon {
    width: 20px;
    position: absolute;
    top: -2px;
}

.dir-ltr .message .messagearea .messagehistory .messagecontent .deleteicon {
    right: 0;
}

.dir-rtl .message .messagearea .messagehistory .messagecontent .deleteicon {
    left: 0;
}

.message .messagearea .messagehistory .notification {
    padding: 10px;
    background-color: #EEEEEE;
    margin-top: 5px;
}

.message .messagearea .messagesend {
    padding-top: 20px;
    clear: both;
}

.message .messagearea .messagesend .messagesendbox {
    width: 100%;
}

.message .messagearea .messagesend fieldset {
    padding: 0px;
    margin: 0;
} /** bring the message send button closer to the message box */

.message .messagearea .messagerecent {
    text-align: left;
    width: 100%;
}

.message .messagearea .messagerecent .singlemessage {
    border-bottom: 1px solid #D3D3D3;
    padding: 10px;
}

.message .messagearea .messagerecent .singlemessage .otheruser span {
    padding: 5px;
}

.message .messagearea .messagerecent .singlemessage .messagedate {
    float: right;
}

.message .hiddenelement {
    display: none;
} /** not just using hidden as mform adds that class to its fieldset */
.message .visible {
    display: inline;
}

.message #usergroupselector.fieldset,
.message #viewing {
    width: 100%;
}

.messagesearchresults {
    margin-bottom: 40px;
}

.messagesearchresults td {
    padding: 0px 10px 0px 20px;
}

.messagesearchresults td span {
    white-space: nowrap;
}

.messagesearchresults td img.userpicture {
    padding-right: .45em;
    vertical-align: text-bottom;
}

.dir-rtl .messagesearchresults td img.userpicture {
    padding-left: .45em;
    padding-right: 0;
}

.messagesearchresults td span img {
    padding: 0 0 0 .45em;
    vertical-align: text-bottom;
}

.dir-rtl .messagesearchresults td span img {
    padding: 0 .45em 0 0;
}

#newmessageoverlay {
    background-color: LightGrey;
    border: 1px solid black;
    padding: 20px;
    position: fixed;
    bottom: 0;
    right: 0;
}

#newmessageoverlay #usermessage {
    padding: 10px;
}

.ie6 #newmessageoverlay {
    position: static;
}

/** Messenger send message dialog */
.core_message-messenger-sendmessage-hidden {
    display: none;
}

.core_message-messenger-sendmessage .message.actions {
    position: relative;
}

.core_message-messenger-sendmessage .message-area {
    height: 240px;
    max-height: 100%;
    position: relative;
    margin-bottom: 10px;
}

.core_message-messenger-sendmessage .message-input {
    width: 100%;
    height: 100%;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.core_message-messenger-sendmessage .message-send {
    margin: 0;
    float: right;
}

.core_message-messenger-sendmessage .message-notice-area {
    display: table;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
}

.core_message-messenger-sendmessage .message-notice {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
}

.core_message-messenger-sendmessage .message-notice > div {
    background: #eee;
    padding: 5px;
    font-size: 12px;
}

.core_message-messenger-sendmessage .message-footer {
    margin-top: 3px;
    line-height: 20px;
}

.core_message-messenger-sendmessage .message-history {
    position: absolute;
    bottom: 0;
}

.dir-rtl .core_message-messenger-sendmessage .message-send {
    float: left;
}