div .trennspalt {
   -moz-column-count: 3;
-moz-column-gap: 20px;
   -webkit-column-count: 3;
-webkit-column-gap: 20px;
   -o-column-count: 3;
   -o-column-gap: 20px;
   -ms-column-count: 3;
   -ms-column-gap: 20px;

   -moz-column-rule: 2px solid red;
   -webkit-column-rule: 2px solid red;
   -o-column-rule: 2px solid red;
   -ms-column-rule: 2px solid red;