Fix popup image sizing

themes/maik-blog/assets/scss/_main.scss

@@ -110,6 +110,7 @@ img {
     width: auto;
     height: auto;
     max-width: 100%;
+    max-height: 100%;
 
     &.left {
         margin-right: auto;
@@ -134,7 +135,7 @@ img {
 figure {
     display: table;
     max-width: 100%;
-    margin: 25px 0;
+    margin: 1em 0;
 
     img {
         border-radius: 8px;
@@ -145,6 +146,11 @@ figure {
         }
     }
 
+    picture {
+        max-height: 100%;
+        max-width: 100%;
+    }
+
     &.left {
         margin-right: auto;
     }
@@ -246,6 +252,10 @@ figure {
         background-color: transparentize(darken($dark-background, 5%), 0.08);
         z-index: 10000;
 
+        picture {
+            max-height: 90%;
+        }
+
         figcaption {
             color: $dark-color;
             font-size: 1.5rem;