add gid.css und doku

README.md

@@ -215,4 +215,17 @@ Heading
 ```
 <script src="/cssjs/feedback.js">
 ... onclick="return ajaxFeedback(this,'ajax.php','margin-top:300px;');" ...
+```
+
+## grid divs in mehreren reihen
+```
+<link href="/cssjs/grid.css" rel="stylesheet">
+
+...
+
+<div class="grid-container">
+  <section>...</section>
+  <section>...</section>
+  <section>...</section>
+</div>
 ```

grid.css

@@ -0,0 +1,17 @@
+.grid-container {
+  columns: 2 500px;
+  column-gap: 30px;
+  margin: 0 auto;
+}
+
+.grid-container>section {
+    width: 150px;
+    margin: 0 1.5rem 1.5rem 0;
+    display: inline-block;
+    width: 100%;
+    border: solid 2px black;
+    padding: 5px;
+    box-shadow: 5px 5px 5px rgb(0 0 0 / 50%);
+    border-radius: 5px;
+    transition: all 0.25s ease-in-out;
+}