style.css

body {
    font-family: arial;
}

.message {
    border-top: solid gray 2px;
    padding: 10px 0px;
}
.message message {
    font-weight: bold;
}
.message name::after {
    content: ": ";
}

.message date {
    float: right;
}

#message {
    width: 80%;
}

/* This button CSS is from https://github.com/MasterOfTheTiger/apod-extension/blob/master/css/style.css under the MIT license */
button {
    border-radius: 5px;
    border-style: solid;
    border-color: #d8d8d8;
    padding: 6px;
    padding-right: 20px;
    padding-left: 20px;
    background-color: #efefef;
    font-size: 13px;
    font-family: arial;
    border-width: thin;
}
button:hover {
    background-color: #d8d8d8;
    cursor: default;
}
select {
    border-color: #d8d8d8;
    background-color: #efefef;
    border-style: solid;
    border-width: thin;
    padding: 5px 10px;
    border-radius: 5px;
}