[design] improve modal header text overflow

Author: zombieFox

css/modal.css

@@ -41,13 +41,15 @@
 border-radius:var(--radius) var(--radius) 00;
 padding:2em;
 max-height:calc(90vh-3.6666666667em);
-overflow: auto;
+overflow-y: auto;
 box-sizing: border-box;
 z-index:1;
 position: relative;
 }
 
-.modal-heading{}
+.modal-heading{
+overflow-x: hidden;
+}
 
 .modal-heading:focus{
 outline: none;