Add close button to Viewer

src/style/atoms/_button-circle.scss

@@ -102,6 +102,7 @@
 
     // Purple color
     &--purple {
+        color: #fff;
         background: $color-primary-tertiary20;
 
         &:hover {

src/style/pages/_viewer-photo.scss

@@ -393,4 +393,35 @@
             display: none;
         }
     }
+
+    // Close button
+    &__close {
+        position: fixed;
+        z-index: 2;
+        top: 16px;
+        right: calc(16px + 44px + 12px);
+
+        @include bp (md) {
+            top: 40px;
+            right: 40px;
+        }
+
+        svg {
+            max-width: 14px;
+            max-height: 14px;
+
+            @include bp (md) {
+                max-width: 20px;
+                max-height: 20px;
+            }
+        }
+
+        // Hover
+        &:hover {
+            svg {
+                transform: rotate3d(0, 0, 1, 90deg) !important;
+                transition-duration: 1.2s;
+            }
+        }
+    }
 }