add aspect-ratio mixin

assets/sass/_theme/_utils.sass

@@ -90,3 +90,20 @@
         z-index: $zindex-stretched-link
         content: ""
 
+@mixin aspect-ratio($width, $height, $tag: 'iframe')
+    #{$tag}
+        aspect-ratio: #{$width}/#{$height}
+        display: block
+        width: 100%
+    @supports not (aspect-ratio: 1)
+        position: relative
+        &::before
+            content: ''
+            padding-top: ($height / $width) * 100%
+            width: 100%
+        #{$tag}
+            bottom: 0
+            left: 0
+            position: absolute
+            right: 0
+            top: 0

assets/sass/_theme/blocks/video.sass

-// .block-video
-//     iframe
-//         aspect-ratio: 16/9
-//         display: block
-//         width: 100%
+/* TODO : https://developer.mozilla.org/fr/docs/Web/HTML/Element/details */
 
-//     @supports not (aspect-ratio: 16/9)
-//         .video
-//             position: relative
-//             &::before
-//                 content: ''
-//                 display: block
-//                 padding-top: 56.25%
-//             iframe
-//                 bottom: 0
-//                 height: 100%
-//                 left: 0
-//                 position: absolute
-//                 top: 0
-//                 width: 100%
+.block-video
+    .video
+        @include aspect-ratio(16, 9, 'iframe')
 
-//     @include media-breakpoint-down(md)
-//         .container
-//             padding-left: 0
-//             padding-right: 0
-//         .transcription
-//             padding-left: $grid-gutter-width
-//             padding-right: $grid-gutter-width
-
-//     @include media-breakpoint-up(md)
-//         @include in-page-without-aside
-//             .block-content
-//                 @include make-row()
-//                 > *
-//                     @include make-col-ready()
-//                     @include make-col(8)
-//                     @include make-col-offset(2)
+    // @include media-breakpoint-up(md)
+    //     @include in-page-without-aside
+    //         .block-content
+    //             @include make-row()
+    //             > *
+    //                 @include make-col-ready()
+    //                 @include make-col(8)
+    //                 @include make-col-offset(2)