Feat: ajout un exercice bilan sur le chapitre

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

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+
+header {
+    background-color: lightgrey;
+    color: white;
+    text-align: center;
+    padding: 20px;
+}
+
+section {
+    margin: 50px;
+    padding: 30px;
+}
+
+#section1 {
+    background-color: lightgrey;
+}
+
+#section3 {
+    border: 4px solid black;
+}
+
+p {
+    color: blue;
+}
+
+ul {
+    background-color: orange;
+}
+
+li {
+    background-color: red;
+}
+
+footer {
+    text-align: center;
+    border: 4px solid black;
+}
+
+img {
+    height: 100px;
+    margin: 20px;
+}