/usr/lib/Wt/examples/simplechat/chatapp.css is in witty-examples 3.3.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | html {
  font-family:arial,sans-serif;
  overflow-x: hidden;
}
h1 {
  font-weight: bold;
}
h2, h3, h4, h5 {
  color: #505050;
}
h2 {
  padding-left: 30px;
  border-bottom: 1px solid #000;
}
h2 span {
  border-bottom: 0.2em solid #000;
}
button {
  padding-left: 5px;
  padding-right: 5px;
  font-size: smaller;
}
.chat {
  border: 2px solid #CCCCCC;
  margin-left: auto;
  margin-right: auto;
  margin-top: 10px;
  margin-bottom: 10px;
  width: 85%;
  height: 300px;
}
span.chat-info {
  font-style: oblique;
  color: gray;
}
textarea.chat-noedit {
  border: 2px solid #73A6FF;
}
.chat-user {
  color: #DD7200;
  font-weight: bold;
  padding-right: 0.2em;
}
.chat-users label {
  margin-left: 0.2em;
}
.chat-self {
  color: #B42600;
  font-weight: bold;
  padding-right: 0.2em;
}
.chat-highlight {
  font-weight: bold;
}
.chat-msgs {
  margin: 0px 1px;
}
.chat-users {
  width: 12ex;
}
.chat-msg {
  padding: 2px;
}
.chat-users div {
  margin: 3px 3px 3px 6px;
}
.chat-users div .chat-self {
  font-weight: bold;
}
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