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/usr/share/messageviewer/about/default/main.css is in kf5-messagelib-data 4:16.04.3-3~deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    margin: 0px;
    padding: 0px;
    background-image: url('background.png');
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
    color: #111111;
    height: 100%;
    width: 100%;
}

img {
    margin: 0px;
    padding: 0px;
}

a {
    color: #1A2C36;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    color: #003B5A;
    text-decoration: none;
    text-shadow: #FFFFFF 0px 0px 6px;
}

.center {
   text-align: center
}

#subtext {
   font-style: italic;
}

#nextlink {
   margin: 0px;
   padding-top: 1em;
    text-align: center;
}

#header {
    background: rgba(255, 255, 255, 0.6);
    width: 100%;
    height: 140px;
    text-align: center;
    padding-top: 10px;
    padding-bottom: 10px;
}

#header img {
    display: inline-block;
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
}

#title {
    display: inline-block;
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
    color: #151515;
    text-shadow: #FFFFFF 0px 0px 5px;
    font-weight: bold;
}


#title h1 {
    margin: 0;
    padding: 0;
    text-align: left;
    font-size: xx-large;
    color: #151515;
}


#box {
    width: 100%;
}

#boxInner {
    margin: 40px;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: 5px;
    box-shadow: 0 0 10px #aaa;
    padding: 20px;
}