Top bar height as css variable

src/assets/styles/_common-variables.scss

@@ -50,6 +50,7 @@ body {
     --iqser-app-name-font-family: 'some placeholder value that should be overridden when configuring a theme';
     --iqser-app-name-font-size: 18px;
     --iqser-app-name-color: black;
+    --iqser-top-bar-height: 61px;
 }
 
 $required-variables: 'iqser-font-family' 'iqser-primary';

src/assets/styles/common-base-screen.scss

@@ -1,7 +1,7 @@
 @use 'common-mixins';
 
 .top-bar {
-    height: 61px;
+    height: var(--iqser-top-bar-height);
     width: 100vw;
     display: flex;
     justify-content: space-between;
@@ -63,7 +63,7 @@
     top: 0;
     z-index: 100;
     right: 0;
-    height: 61px;
+    height: var(--iqser-top-bar-height);
     word-break: break-all;
     display: flex;
     justify-content: center;