diff --git a/amd/src/studyplan-editor-components.js b/amd/src/studyplan-editor-components.js
index 09fcd3f..7437e1c 100644
--- a/amd/src/studyplan-editor-components.js
+++ b/amd/src/studyplan-editor-components.js
@@ -1525,26 +1525,18 @@ export default {
                     // When one of those updates is received, record the height and recalculate the total height of the 
                     // header
                     if(lineid == this.value.id){
-                        let offset = "";
-                        if(this.value.sequence==1 || this.value.sequence==this.numlines) {
-                            const cstyle = getComputedStyle(this.$refs.mainEl);
-                            offset = " + " +cstyle.borderTopWidth + " + " + cstyle.borderBottomWidth;
-                            //debug.info("Adding extra height to offset border",cstyle);
-                        }
-
                         const items = document.querySelectorAll(
-                            `.t-studyplan-content-edit .t-studyline-slot-0[data-studyline='${this.value.id}']`);
+                            `.t-studyline-slot-0[data-studyline='${this.value.id}']`);
                         
+                        // determine the height of all the lines and add them up.
                         let heightSum = 0;
-                        for(const ix in items){
-                            debug.info(items[ix]);
-                            const height = items[ix].clientHeight;
+                        items.forEach((el) => {
+                            const height = el.offsetHeight;
                             heightSum += height;
-                        }
+                        });
 
-                        debug.info(`Line height change line ${lineid} layer ${layerid}`, items, heightSum);
-                        const heightStyle=`calc( ${heightSum}px ${offset})`;
-                        //debug.info(`Received line height change line ${lineid} to ${heightStyle}`);
+                        const heightStyle=`${heightSum-0.5}px`;
+                        debug.info(`Received line height change line ${lineid} to ${heightStyle}`);
                         this.$refs.mainEl.style.height = heightStyle;
                     }
                 }