doc: restore default.css

This partially reverts 9ce64ba1.

FATE still needs it until its design is updated to the new website
version.

doc/default.css

+a.summary-letter {
+    text-decoration: none;
+}
+
+a {
+    color: #2D6198;
+}
+
+a:visited {
+    color: #884488;
+}
+
+#banner {
+    background-color: white;
+    position: relative;
+    text-align: center;
+}
+
+#banner img {
+    margin-bottom: 1px;
+    margin-top: 5px;
+}
+
+#body {
+    margin-left: 1em;
+    margin-right: 1em;
+}
+
+body {
+    background-color: #313131;
+    margin: 0;
+    text-align: justify;
+}
+
+.center {
+    margin-left: auto;
+    margin-right: auto;
+    text-align: center;
+}
+
+#container {
+    background-color: white;
+    color: #202020;
+    margin-left: 1em;
+    margin-right: 1em;
+}
+
+#footer {
+    text-align: center;
+}
+
+h1 a, h2 a, h3 a, h4 a {
+    text-decoration: inherit;
+    color: inherit;
+}
+
+h1, h2, h3, h4 {
+    padding-left: 0.4em;
+    border-radius: 4px;
+    padding-bottom: 0.25em;
+    padding-top: 0.25em;
+    border: 1px solid #6A996A;
+}
+
+h1 {
+    background-color: #7BB37B;
+    color: #151515;
+    font-size: 1.2em;
+    padding-bottom: 0.3em;
+    padding-top: 0.3em;
+}
+
+h2 {
+    color: #313131;
+    font-size: 1.0em;
+    background-color: #ABE3AB;
+}
+
+h3 {
+    color: #313131;
+    font-size: 0.9em;
+    margin-bottom: -6px;
+    background-color: #BBF3BB;
+}
+
+h4 {
+    color: #313131;
+    font-size: 0.8em;
+    margin-bottom: -8px;
+    background-color: #D1FDD1;
+}
+
+img {
+    border: 0;
+}
+
+#navbar {
+    background-color: #738073;
+    border-bottom: 1px solid #5C665C;
+    border-top: 1px solid #5C665C;
+    margin-top: 12px;
+    padding: 0.3em;
+    position: relative;
+    text-align: center;
+}
+
+#navbar a, #navbar_secondary a {
+    color: white;
+    padding: 0.3em;
+    text-decoration: none;
+}
+
+#navbar a:hover, #navbar_secondary a:hover {
+    background-color: #313131;
+    color: white;
+    text-decoration: none;
+}
+
+#navbar_secondary {
+    background-color: #738073;
+    border-bottom: 1px solid #5C665C;
+    border-left: 1px solid #5C665C;
+    border-right: 1px solid #5C665C;
+    padding: 0.3em;
+    position: relative;
+    text-align: center;
+}
+
+p {
+    margin-left: 1em;
+    margin-right: 1em;
+}
+
+pre {
+    margin-left: 3em;
+    margin-right: 3em;
+    padding: 0.3em;
+    border: 1px solid #bbb;
+    background-color: #f7f7f7;
+}
+
+dl dt {
+    font-weight: bold;
+}
+
+#proj_desc {
+    font-size: 1.2em;
+}
+
+#repos {
+    margin-left: 1em;
+    margin-right: 1em;
+    border-collapse: collapse;
+    border: solid 1px #6A996A;
+}
+
+#repos th {
+    background-color: #7BB37B;
+    border: solid 1px #6A996A;
+}
+
+#repos td {
+    padding: 0.2em;
+    border: solid 1px #6A996A;
+}