Add specific styles for the card tag form element.

Also add a `.hidden` class in the baggy theme to have consistency with material.

app/Resources/static/themes/baggy/css/layout.scss

@@ -295,6 +295,15 @@ div.pagination ul {
   }
 }
 
-.hide {
+.card-tag-form {
+  display: inline-block;
+}
+
+.card-tag-form input[type="text"] {
+  min-width: 20em;
+}
+
+.hide,
+.hidden {
   display: none;
 }

app/Resources/static/themes/material/css/cards.scss

@@ -180,6 +180,17 @@ a.original:not(.waves-effect) {
   flex-grow: 1;
 }
 
+.card-tag-form {
+  display: flex;
+  min-width: 100px;
+  flex-grow: 1;
+}
+
+.card-tag-form input {
+  margin-bottom: 0;
+  height: 2rem;
+}
+
 .card-tag-rss {
   display: flex;
 }