Fix ratio utility

assets/styles/utilities/_ratio.scss

@@ -23,7 +23,6 @@ $aspect-ratios: (
 //   <div class="o-ratio -16:9">
 //
 //
-.o-ratio {
 @each $ratio in $aspect-ratios {
     @each $antecedent, $consequent in $ratio {
         @if (type-of($antecedent) != number) {
@@ -34,11 +33,10 @@ $aspect-ratios: (
             @error "`#{$consequent}` needs to be a number."
         }
 
-            &.-#{$antecedent}\:#{$consequent}::before {
+        &.u-#{$antecedent}\:#{$consequent}::before {
             padding-bottom: ($consequent/$antecedent) * 100%;
         }
     }
 }
-}
 
 /* stylelint-enable */