/indra/newview/skins/default/xui/en/floater_critical.xml

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<floater
 legacy_header_height="18"
 can_close="false"
 can_minimize="false"
 height="500"
 layout="topleft"
 name="modal container"
 open_positioning="centered"
 width="600">
    <button
     height="20"
     label="Continue"
     label_selected="Continue"
     layout="topleft"
     left="484"
     name="Continue"
     top="465"
     width="100" />
    <text
     type="string"
     length="1"
     follows="left|top"
     font="SansSerif"
     height="20"
     layout="topleft"
     left="20"
     name="tos_heading"
     top="20"
     width="552">
        Please read the following message carefully.
    </text>
    <text_editor
     type="string"
     length="1"
     bg_readonly_color="1 1 1 1"
     bottom="455"
     follows="left|top"
     font="SansSerif"
     layout="topleft"
     left="20"
     max_length="65536"
     name="tos_text"
     right="-20"
     text_readonly_color="0 0 0 1"
     top="45"
     word_wrap="true">
        TOS_TEXT
    </text_editor>
</floater>