feat: Improvements for mobile version (#776)

client/src/components/Card/Card.module.scss

@@ -21,6 +21,13 @@
       background: #ebeef0;
       color: #516b7a;
     }
+
+    @media only screen and (max-width: 797px) {
+      &:focus, &:active {
+        background: #ebeef0;
+        color: #516b7a;
+      }
+    }
   }
 
   .attachment {
@@ -63,6 +70,12 @@
         opacity: 1;
       }
     }
+
+    @media only screen and (max-width: 797px) {
+      .target {
+        opacity: 1;
+      }
+    }
   }
 
   .content {