#message-tray {
    background-position: 0 0;
    height: 36px;
}

.message-tray-summary {
    height: 36px;
}

#message-tray {
    background-position: 0 0;
    height: 48px;
}

.message-tray-summary {
    height: 48px;
}

Use a height of 48px instead of 36px.
Use a height of 48px instead of 36px.
