Image gallery size fixes

app/assets/stylesheets/attachments.css

@@ -3,8 +3,8 @@
     block-size: auto;
     display: block;
     inline-size: fit-content;
-    position: relative;
     max-inline-size: 100%;
+    position: relative;
 
     progress {
       inline-size: 100%;
@@ -35,8 +35,7 @@
 
       @supports (field-sizing: content) {
         field-sizing: content;
-        inline-size: auto;
-        min-inline-size: 20ch;
+        inline-size: 100%;
       }
     }
   }

app/assets/stylesheets/lexxy.css

@@ -188,4 +188,18 @@
   .attachment {
     margin-inline: 0;
   }
+
+  .attachment-gallery {
+    .attachment {
+      display: inline-block;
+      inline-size: calc(33.333% - 0.8ch);
+    }
+
+    &.attachment-gallery--2,
+    &.attachment-gallery--4 {
+      .attachment {
+        inline-size: calc(50% - 0.8ch);
+      }
+    }
+  }
 }