fixed changing logo size

src/app/components/main-navigation/main-navigation.component.html

@@ -37,7 +37,7 @@
         fxShow="true" fxHide.gt-sm="true">
         <mat-icon aria-label="Side nav toggle icon">menu</mat-icon>
       </button>
-      <mat-icon svgIcon="logo" style="width: 35px; margin: 5px"></mat-icon>
+      <mat-icon svgIcon="logo" style="min-width: 35px; margin: 5px"></mat-icon>
       <span>Greenvironment</span>
       <nav mat-tab-nav-bar backgroundColor="primary" fxShow="true" fxHide.lt-md="true">
         <div [hidden]="!loggedIn">