fix(style): color & shadow improve

Author: Kunduin

src/styles.css

@@ -1,7 +1,4 @@
 .rus {
-  --theme-color: hsl(262, 24%, 84%);
-  --theme-background: hsl(262, 25%, 98%);
-
   position: relative;
   min-height: 30px;
   overflow: hidden;
@@ -10,11 +7,8 @@
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
     Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial,
     sans-serif;
-  background-color: var(--theme-background);
-
-  /* border: 1px dashed var(--theme-color); */
+  border: 1px solid #d9d9d9;
   border-radius: 5px;
-  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.16);
   cursor: pointer;
 }