Feat: ajoute la modification du CSS et des exemples à reproduire

1NSI/01_Web_HTML_CSS/solutions/page_CSS/style.css

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+body {
+    text-align: center;
+}
+
+a {
+    color: green;
+}
+
+li {
+    display: inline;
+}
+
+table {
+    border: 1px solid black;
+}
+
+.balise {
+    background-color: lightgray;
+    text-align: left;
+    width: 50%;
+    margin-left: auto;
+    margin-right: auto;
+    color: darkgrey;
+}
+
+#link {
+    background-color: lightgrey;
+}
+
+h1 {
+    color: lightgrey;
+    background-image: url("./220px-Richard_Stallman_2005_(chrys).jpg");
+    background-color: #cccccc; /* Used if the image is unavailable */
+    height: 300px; /* You must set a specified height */
+    background-position: center; /* Center the image */
+    background-repeat: no-repeat; /* Do not repeat the image */
+    background-size: cover;
+}
+
+h2 {
+    color: black;
+}
+
+#richard {
+    display: none;
+}