Pack gallery photos with CSS columns

_sass/_layout.scss

@@ -227,14 +227,16 @@ hr {
 }
 
 .art .post-list {
-  display: grid;
+  column-count: 2;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
+  column-gap: $spacing-unit;
-  gap: $spacing-unit;
-  align-items: start;
 
   > li {
-    min-width: 0;
+    display: inline-block;
+    width: 100%;
     margin-top: 0;
+    margin-bottom: $spacing-unit;
+    break-inside: avoid;
+    -webkit-column-break-inside: avoid;
   }
 
   .post-content > p:last-child {
@@ -251,7 +253,7 @@ hr {
   }
 
   @include media-query($on-palm) {
-    grid-template-columns: 1fr;
+    column-count: 1;
   }
 }