доделал

assets/css/gp-style-core.css

@@ -446,7 +446,7 @@ button{
 
 /* breadcrumbs */
 .breadcrumbs{
-  margin: 24px;
+  margin: 96px 24px 24px;
 
   display: flex;
   align-items: center;

assets/css/gp-style-desktop.css

@@ -6,6 +6,13 @@
     position: relative;
 
     background-color: var(--background-white);
+
+    position: fixed;
+    left: 0;
+    top: 0;
+    right: 0;
+
+    z-index: 200;
 }
 .header::after{
     content: '';
@@ -78,6 +85,9 @@
     width: 100%;
     height: 100%;
 }
+.header__logo-white{
+  display: none;
+}
 
 .header__menu-block{
     position: absolute;
@@ -238,11 +248,14 @@
     text-decoration: none;
 }
 .header.white{
-  background-color: thistle;
+  /* background-color: thistle; */
 }
 .header.white .header__logo-black{
   display: none;
 }
+.header.white .header__logo-white{
+  display: block;
+}
 .header.white .main-menu__link{
   color: var(--text-white);
 }