style: 更新按钮背景颜色并简化条件判断逻辑

将按钮的背景颜色从绿色(#6fc16d)更改为深灰色(#333)，以提升视觉一致性。同时，简化了sql.html中的条件判断逻辑，移除冗余的`element.language_requirements`检查，使代码更简洁。

css/index.css

@@ -410,6 +410,7 @@
   width: 100%;
   height: 36px;
   background-color: #6fc16d;
+  background-color: #333;
   border-radius: 0 0 12px 12px;
   font-size: 14px;
   font-family: "PingFangSC-Semibold", "PingFang SC Semibold", "PingFang SC", sans-serif;

css/index.less

@@ -466,6 +466,7 @@
             height: 36px;
             // background-color: rgba(123, 140, 211, 1);
             background-color: rgba(111, 193, 109, 1);
+            background-color: #333;
             border-radius: 0 0 12px 12px;
             font-size: 14px;
 

html/sql.html

@@ -10,8 +10,8 @@
         <script>
             console.log(aaa);
             aaa.forEach((element) => {
-                if (element.language_requirements != "[]" && element.standardized_tests_requirements != "[]") {
-                    console.log(JSON.parse(element.language_requirements), element.program_id);
+                if (element.standardized_tests_requirements != "[]") {
+                    console.log(JSON.parse(element.standardized_tests_requirements), element.program_id);
                 }
             });
         </script>