Web: style books into rows and columns in books page

docs/_pages/books.md

@@ -8,30 +8,39 @@ permalink: /books/
 
 <br>
 
-<a href="https://www.amazon.com/dp/B000W94CZ8?ref_=cm_sw_r_kb_dp_JESRFYYZAPP9YX59MA84&tag=kpembed-20&linkCode=kpe">
-    <img src="https://m.media-amazon.com/images/I/51pmcBlf3LL._SY385_.jpg" width="320px">
-</a>
-
-<br>
-
-<a href="https://www.amazon.com/dp/B007T97DJQ?ref_=cm_sw_r_kb_dp_8H0QD7JVB38VWZG1XMGA&tag=kpembed-20&linkCode=kpe">
-    <img src="https://m.media-amazon.com/images/I/91fhWNG5VNL._SL1500_.jpg" width="320px">
-</a>
-
-<br>
-
-<a href="https://www.amazon.com/dp/B00F4P0OWA?ref_=cm_sw_r_kb_dp_GA3J5SGW35XW8RWX21HQ&tag=kpembed-20&linkCode=kpe">
-    <img src="https://m.media-amazon.com/images/I/81Z8F4nSTnL._SL1500_.jpg" width="320px">
-</a>
-
-<br>
-
-<a href="https://www.amazon.com/dp/B06Y63RDS2?ref_=cm_sw_r_kb_dp_8SJ3XXZX75AQPNFZV0PN&tag=kpembed-20&linkCode=kpe">
-    <img src="https://m.media-amazon.com/images/I/5185Icc8gOL.jpg" width="320px">
-</a>
-
-<br>
-
-<a href="https://www.amazon.com/dp/B08TRN5LRT?ref_=cm_sw_r_kb_dp_A29QMGVX07EC2P47T8KW&tag=kpembed-20&linkCode=kpe">
-    <img src="https://m.media-amazon.com/images/I/71zxswmkCiL._SL1500_.jpg" width="320px">
-</a>
+<div class="row">
+    <div class="col-md-6 mb-5">
+        <a href="https://www.amazon.com/dp/B000W94CZ8?ref_=cm_sw_r_kb_dp_JESRFYYZAPP9YX59MA84&tag=kpembed-20&linkCode=kpe">
+            <img src="https://m.media-amazon.com/images/I/51pmcBlf3LL._SY385_.jpg" class="card-img-top">
+        </a>
+    </div>
+    <div class="col-md-6 mb-5">
+        <a href="https://www.amazon.com/dp/B007T97DJQ?ref_=cm_sw_r_kb_dp_8H0QD7JVB38VWZG1XMGA&tag=kpembed-20&linkCode=kpe">
+            <img src="https://m.media-amazon.com/images/I/91fhWNG5VNL._SL1500_.jpg" class="card-img-top">
+        </a>
+    </div>
+</div>
+
+<div class="row">
+    <div class="col-md-6 mb-5">
+        <a href="https://www.amazon.com/dp/B00F4P0OWA?ref_=cm_sw_r_kb_dp_GA3J5SGW35XW8RWX21HQ&tag=kpembed-20&linkCode=kpe">
+            <img src="https://m.media-amazon.com/images/I/81Z8F4nSTnL._SL1500_.jpg" class="card-img-top">
+        </a>
+    </div>
+    <div class="col-md-6 mb-5">
+        <a href="https://www.amazon.com/dp/B06Y63RDS2?ref_=cm_sw_r_kb_dp_8SJ3XXZX75AQPNFZV0PN&tag=kpembed-20&linkCode=kpe">
+            <img src="https://m.media-amazon.com/images/I/5185Icc8gOL.jpg" class="card-img-top">
+        </a>
+    </div>
+</div>
+
+<div class="row">
+    <div class="col-md-6 mb-5">
+        <a href="https://www.amazon.com/dp/B08TRN5LRT?ref_=cm_sw_r_kb_dp_A29QMGVX07EC2P47T8KW&tag=kpembed-20&linkCode=kpe">
+            <img src="https://m.media-amazon.com/images/I/71zxswmkCiL._SL1500_.jpg" class="card-img-top">
+        </a>
+    </div>
+    <div class="col-md-6 mb-5">
+
+    </div>
+</div>