before and after slider

Author: JY-Joy

docs/static/css/index.css

@@ -165,7 +165,7 @@ div#comparison {
 }
 
 div#comparison figure {
-  background-image: "./static/images/a_dog_input.png";
+  background-image: url("./static/images/a_dog_input.png");
   background-size: cover;
   position: relative;
   font-size: 0;
@@ -180,7 +180,7 @@ div#comparison figure>img {
 }
 
 div#comparison figure div {
-  background-image: "./static/images/a_dog_output.png";
+  background-image: url("./static/images/a_dog_output.png");
   background-size: cover;
   position: absolute;
   width: 50%;