Move textarea styling into form module

h/static/styles/forms.scss

@@ -76,6 +76,12 @@
   }
 }
 
+.form-textarea {
+  min-height: 8em;
+  max-width: 100%;
+  resize: vertical;
+}
+
 .form-field-error {
   .form-input {
     &, &:focus, &.js-focus {

h/static/styles/reset.scss

@@ -58,3 +58,8 @@ img::selection,
 img::-moz-selection {
   background: transparent;
 }
+
+// Custom elements
+markdown {
+  display: block;
+}