Try fixing copy button flying out

_sass/minimal-mistakes/_page.scss

@@ -139,6 +139,10 @@ body {
     }
   }
 
+  pre {
+    position: relative;
+  }
+
   :not(pre) > code {
     padding-top: 0.1rem;
     padding-bottom: 0.1rem;

_sass/minimal-mistakes/_utilities.scss

@@ -608,6 +608,10 @@ a.reversefootnote {
 }
 
 pre {
+  &.highlight .clipboard-copy-button {
+    color: #ffffca;
+  }
+
   .clipboard-copy-button {
     display: block;
     position: absolute;
@@ -621,14 +625,9 @@ pre {
     outline: none;
     border-radius: 0.1em;
     padding: 0.2em 0.5em;
-    color: white;
     opacity: 0.4;
     transition: color 0.25s linear -0.25s, opacity 0.25s linear;
 
-    &:hover {
-      color: #ffffca;
-    }
-
     &::before {
       content: '';
       position: absolute;