Fix gh-4091

[zhanming]

update wro.xml and navbar's css.

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[codecov[bot]]

Codecov Report

Merging #4092 (144b81e) into 3.1.x (2899b42) will decrease coverage by 0.03%. The diff coverage is n/a.

@@             Coverage Diff              @@
##              3.1.x    #4092      +/-   ##
============================================
- Coverage     55.53%   55.49%   -0.04%     
+ Complexity      525      524       -1     
============================================
  Files            58       58              
  Lines          2501     2501              
  Branches        234      234              
============================================
- Hits           1389     1388       -1     
- Misses         1023     1024       +1     
  Partials         89       89              

Impacted Files	Coverage Δ
.../netflix/eureka/server/EurekaServerConfigBean.java	22.50% <0.00%> (-0.24%)	:arrow_down:

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