Make KaTeX not break inside math, and clean up container code

themes/vanilla/assets/scss/sidenotes.scss

@@ -91,7 +91,6 @@ $sidenote-highlight-border-width: .2rem;
     }
 
     .container {
-        position: relative;
         left: -$sidenote-width/2
     }
 }

themes/vanilla/assets/scss/style.scss

@@ -32,10 +32,6 @@ body {
   text-align: justify;
 }
 
-main {
-    position: relative;
-}
-
 h1, h2, h3, h4, h5, h6 {
   margin-bottom: .1rem;
   margin-top: .5rem;
@@ -65,6 +61,7 @@ pre code {
 }
 
 .container {
+  position: relative;
   margin: auto;
   width: 100%;
   max-width: $container-width;
@@ -175,3 +172,7 @@ td {
     }
     padding: 0.5rem;
 }
+
+.katex-html {
+    white-space: nowrap;
+}