fix: angular material footer logo

Fixes Angular Material footer logo for IE11

Fixes angular#1027

Author: kian23kpt

material.angular.io/material.angular.io/material.angular.io/material.angular.io/material.angular.io/src/app/shared/footer/footer.scss

@@ -25,6 +25,7 @@
   flex: 1;
 
   .angular-material-logo {
+    width: 40px;
     height: 40px;
     margin: 10px 0 10px 16px;
   }