Fix single page layout

assets/style.scss

@@ -177,8 +177,9 @@ article {
 			align-items: center;
 			height: 200px;
 			justify-content: center;
+			min-width: 200px;
 			overflow: hidden;
-			padding-right: 1.5rem;
+			margin-right: 1.5rem;
 			width: 200px;
 
 			@media screen and (min-width: $small) {

layouts/_default/single.html

@@ -6,7 +6,15 @@
 	<section class="text">{{ $textContent }}</section>
 	<section class="image">
 		<img alt="{{ .Title }}" src="{{ .RelPermalink }}">
-		by <a href="{{ .Params.copyright_url }}"{{ if hasPrefix .Params.copyright_url "https://" }} target="_blank"{{ end }}>{{ .Params.copyright }}</a>
+{{ $params := .Params }}
+{{ with $params.copyright }}
+{{ $copyright := . }}
+{{ with $params.copyright_url }}
+		by <a href="{{ . }}"{{ if hasPrefix . "https://" }} target="_blank"{{ end }}>{{ $copyright }}</a>
+{{ else }}
+		by {{ $copyright }}
+{{ end }}
+{{ end }}
 	</section>
 </article>
 {{ else }}