Simplify & improve CSS

src/page/header/header.scss

@@ -13,6 +13,10 @@
     color: var(--accent-color);
   }
 
+  :focus:not(:hover) {
+    outline: var(--very-light-text-color) solid 3px !important;
+  }
+
   h1,
   .placeholder {
     @include title-font();
@@ -27,7 +31,6 @@
   }
 
   p {
-    @include main-font();
     text-align: justify;
   }
 

src/page/header/theme-switcher/theme-switcher.scss

@@ -54,7 +54,7 @@
     &:before {
       transform: translateY(-50%) translateX(calc(3 * #{$margin} + #{$icon-size}));
 
-      animation: shine 3s linear alternate infinite;
+      animation: shine 2s linear alternate infinite;
       background-color: var(--sun-color);
       @keyframes shine {
         from {
@@ -63,7 +63,7 @@
         }
 
         to {
-          filter: brightness(1.1);
+          filter: brightness(1.2);
           box-shadow: 0 0 15px 2px var(--sun-color);
         }
       }