diff --git a/forum/qa-plugin/user-changeable-theme/user-theme-layer.php b/forum/qa-plugin/user-changeable-theme/user-theme-layer.php
index 1a5f2dfe..9a68aaf2 100644
--- a/forum/qa-plugin/user-changeable-theme/user-theme-layer.php
+++ b/forum/qa-plugin/user-changeable-theme/user-theme-layer.php
@@ -37,60 +37,64 @@ public function head_lines()
             if (isset($_POST['select_theme'])) {
                 $this->save_theme($_POST['select_theme']);
             }
-            $this->content['head_lines'][] = '<style>
-				.widget-select-theme {
-					display: -webkit-flex;
-					display: -ms-flexbox;
-					display: flex;
-					-webkit-justify-content: center;
-					-ms-flex-pack: center;
-					        justify-content: center;
-					-webkit-align-items: center;
-					-ms-flex-align: center;
-					        align-items: center
-				}
+            $content = '<style>
+              .widget-select-theme {
+                display: -webkit-flex;
+                display: -ms-flexbox;
+                display: flex;
+                -webkit-justify-content: center;
+                -ms-flex-pack: center;
+                        justify-content: center;
+                -webkit-align-items: center;
+                -ms-flex-align: center;
+                        align-items: center
+              }
 
-				.widget-select-theme__text {
-					margin: 0 10px 2px 0;
-				}
+              .widget-select-theme__text {
+                margin: 0 10px 2px 0;
+              }
 
-				.widget-select-theme__button {
-					background: none;
-					color: #34495e;
-					background: white;
-					border: 1px solid #34495e;
-					width: 80px;
-					padding: 10px 0;
-					transition: all 0.2s;
-					outline: none;
-				}
+              .widget-select-theme__button {
+                background: none;
+                color: #34495e;
+                background: white;
+                border: 1px solid #34495e;
+                width: 80px;
+                padding: 10px 0;
+                transition: all 0.2s;
+                outline: none;
+              }
 
-				.widget-select-theme__button--dark {
-					background: #34495e;
-					color: white;
-					border-left: none;
-				}
+              .widget-select-theme__button--dark {
+                background: #34495e;
+                color: white;
+                border-left: none;
+              }
 
-				.widget-select-theme__button--dark:hover, .widget-select-theme__button--dark:focus {
-					background: #1e2f40;
-				}
+              .widget-select-theme__button--dark:hover, .widget-select-theme__button--dark:focus {
+                background: #1e2f40;
+              }
 
-				.widget-select-theme__button--light {
-					pointer-events: none;
-				}
+              .widget-select-theme__button--light {
+                pointer-events: none;
+              }
 
-				/* force to display theme buttons (mobile) */
-				@media (max-width: 1179px) {
-					.qa-sidepanel {
-						width: 100% !important;
-						display: block !important;
-					}
-
-					.qa-sidepanel > div:not(.qa-widgets-side-bottom) {
-						display: none;
-					}
-				}
+              /* force to display theme buttons (mobile) */
+              @media (max-width: 1179px) {
+                .qa-sidepanel {
+                  width: 100% !important;
+                  display: block !important;
+                }
+              ';
+            if (!qa_is_mobile_probably()) {
+                $content .= '  .qa-sidepanel > div:not(.qa-widgets-side-bottom) {
+                  display: none;
+                }
+              ';
+            }
+            $content .= '}
             </style>';
+            $this->content['head_lines'][] = $content;
         }
         qa_html_theme_base::head_lines();
     }