docs: update theme preview and translation (#262)

assets/css/_partial/_header.scss

@@ -26,7 +26,7 @@ header {
 .header-title {
   font-family: $header-title-font-family;
   font-weight: bold;
-  margin-right: .5rem;
+  margin: 0 .5rem;
   min-width: 10%;
   overflow: hidden;
   white-space: nowrap;
@@ -140,7 +140,7 @@ header {
   line-height: $header-height;
 
   .header-wrapper {
-    padding: 0 1.5rem;
+    padding: 0 10vw;
 
     .header-title {
       font-size: $header-title-font-size;
@@ -329,7 +329,7 @@ header {
   @include box-shadow(0 .125rem .25rem rgba(0, 0, 0, .1));
 
   &.desktop {
-    right: 1.5rem;
+    right: 10vw;
     width: 30rem;
   }
 

assets/css/_partial/_single/_code.scss

@@ -22,6 +22,7 @@ pre {
   img {
     min-height: 1.25em;
     max-height: 1.25em;
+    vertical-align: text-bottom;
   }
 }