diff --git a/wav-calculator-mono.php b/wav-calculator-mono.php
index f7b0898..76ae6ed 100644
--- a/wav-calculator-mono.php
+++ b/wav-calculator-mono.php
@@ -178,72 +178,6 @@
         .wav-calculator-invalid:focus {
             border-color: #999999;
         }
-
-        @media (prefers-color-scheme: dark) {
-            body {
-                background-color: #000000;
-                color: #ffffff;
-            }
-
-            .wav-calculator-container {
-                background-color: #111111;
-                border-color: #333333;
-            }
-
-            .wav-calculator-title, .wav-calculator-label {
-                color: #ffffff;
-            }
-
-            .wav-calculator-input {
-                background-color: #111111;
-                border-color: #333333;
-                color: #ffffff;
-            }
-
-            .wav-calculator-input:focus {
-                border-color: #ffffff;
-            }
-
-            .wav-calculator-results {
-                background-color: #1a1a1a;
-                border-color: #333333;
-            }
-
-            .wav-calculator-result-item {
-                color: #cccccc;
-            }
-
-            .wav-calculator-result-item strong {
-                color: #ffffff;
-            }
-
-            .wav-calculator-radio-button label,
-            .wav-calculator-select-button label {
-                background-color: #111111;
-                border-color: #333333;
-                color: #ffffff;
-            }
-
-            .wav-calculator-radio-button input[type="radio"]:checked + label,
-            .wav-calculator-select-button input[type="radio"]:checked + label {
-                background-color: #ffffff;
-                color: #000000;
-                border-color: #ffffff;
-            }
-
-            .wav-calculator-unit {
-                color: #999999;
-            }
-
-            .wav-calculator-invalid {
-                border-color: #666666;
-                background-color: #1a1a1a;
-            }
-
-            .wav-calculator-invalid + .wav-calculator-unit {
-                color: #666666;
-            }
-        }
     </style>
 
     <div class="wav-calculator-container">