Fix darkmode en celulares (PR #28 by @faculerena)

Fix darkmode en celulares

Author: iglosiggio

css/main.css

@@ -150,12 +150,12 @@ table td { border: 1px solid var(--light-text-color); }
 .site-title { font-size: 26px; font-weight: 300; line-height: 54px; letter-spacing: -1px; margin-bottom: 0; float: left; }
 .site-title, .site-title:visited { color: #424242; }
 
-.site-nav { float: right; line-height: 54px; }
+.site-nav { float: right; line-height: 54px;}
 .site-nav .nav-trigger { display: none; }
 .site-nav .menu-icon { display: none; }
 .site-nav .page-link { color: var(--main-text-color); line-height: 1.5; }
 .site-nav .page-link:not(:last-child) { margin-right: 20px; }
-@media screen and (max-width: 600px) { .site-nav { position: absolute; top: 9px; right: 15px; background-color: #fdfdfd; 
+@media screen and (max-width: 600px) { .site-nav { position: absolute; top: 9px; right: 15px; background-color: var(--background-color); 
   border: 1px solid var(--border-color); border-radius: 5px; text-align: right; }
   .site-nav label[for="nav-trigger"] { display: block; float: right; width: 36px; height: 36px; z-index: 2; cursor: pointer; }
   .site-nav .menu-icon { display: block; float: right; width: 36px; height: 26px; line-height: 0; padding-top: 10px; text-align: center; }