modify

@@ -8,7 +8,7 @@
         <navbar />
         <tags-view v-if="needTagsView" />
       </div>
-      <app-main />
+      <app-main ref="appMainBlock" />
       <right-panel v-if="false">
         <settings />
       </right-panel>

@@ -6,6 +6,7 @@ const WIDTH = 992; // refer to Bootstrap's responsive design
 export default {
   watch: {
     $route(route) {
+      this.getBlockCurrentHeight();
       if (this.device === "mobile" && this.sidebar.opened) {
         store.dispatch("app/closeSideBar", { withoutAnimation: false });
       }
@@ -22,7 +23,10 @@ export default {
     if (isMobile) {
       store.dispatch("app/toggleDevice", "mobile");
       store.dispatch("app/closeSideBar", { withoutAnimation: true });
-    }
+    };
+    this.$nextTick(() => {
+      this.getBlockCurrentHeight();
+    });
   },
   methods: {
     // use $_ for mixins properties
@@ -41,5 +45,11 @@ export default {
         }
       }
     },
+    getBlockCurrentHeight() {
+      let appHeaderHeight = this.$refs.headerRef.clientHeight;
+      let appMainHeight = this.$refs.appMainBlock.$el.clientHeight;
+      this.$store.dispatch("app/setAppHeaderBlockCH", appHeaderHeight);
+      this.$store.dispatch("app/setAppMainBlockCH", appMainHeight);
+    },
   },
 };

@@ -10,6 +10,8 @@ const state = {
   device: "desktop",
   //size: Cookies.get('size') || 'medium'
   size: localStorage.getItem("size") || "medium",
+  headerBlockClientHeight: null,
+  appMainBlockClientHeight: null,
 };
 
 const mutations = {
@@ -41,7 +43,10 @@ const mutations = {
   SET_APPHEADERBLOCKCH: (state, height) => {
     state.headerBlockClientHeight = height;
   },
-}
+  SET_APPMAINBLOCKCH: (state, height) => {
+    state.appMainBlockClientHeight = height;
+  },
+};
 
 const actions = {
   toggleSideBar({ commit }) {
@@ -56,6 +61,12 @@ const actions = {
   setSize({ commit }, size) {
     commit("SET_SIZE", size);
   },
+  setAppHeaderBlockCH({ commit }, height) {
+    commit("SET_APPHEADERBLOCKCH", height);
+  },
+  setAppMainBlockCH({ commit }, height) {
+    commit("SET_APPMAINBLOCKCH", height);
+  },
 };
 
 export default {