Left menu is responsive

src/styles/base/header.scss

@@ -168,6 +168,10 @@
           &::before {
             margin-left: 1.5rem;
           }
+
+          @include breakpoint(sm) {
+            display: none;
+          }
         }
       }
     }
@@ -236,5 +240,13 @@
       }
     }
   }
+
+  .mobile-menu-icon {
+    display: none;
+
+    @include breakpoint(sm) {
+      display: block;
+    }
+  }
 }
 

src/styles/base/menu-left.scss

@@ -188,4 +188,21 @@
       background-color: $color-213-13-86;
     }
   }
+
+  &.mobile-opened {
+    @include breakpoint(sm) {
+      bottom: 0;
+      min-width: 80%;
+      position: fixed;
+      right: 0;
+      top: 0;
+      z-index: 1;
+    }
+  }
+
+  &.mobile-closed {
+    @include breakpoint(sm) {
+      display: none;
+    }
+  }
 }