Eclipse fails to serve CSS file

[Velusamy Velu]

My GWT application development ran into a problem that poses a challenge to resolve. The application is developed with GWT 2.7.0 and a pilot is running at PeruseLabs (the Pilot Screen clip is below). This application has been in development for quite some months. However, in development the CSS file PeruseLabs.css doesn't seem to be loading (I don't see any evidence that it's loading). This started happening since mid January 2018. The CSS (class icon) loads as expected in the pilot <img class="icon responsive-img" src="images/bonds/singleBond.svg"> but not in development (Dev Screen clip all the way down). To reiterate - when this project is built and deployed in "prod" it works as expected. The development has come to a screeching halt though.

The corresponding icon class is 

.icon {

    width: 45px;

    margin: 7px;

    border-radius: 5px;

    cursor: pointer;

}

My development environment is -

Java 8 (Ver 1.8.0_151)

Eclipse Oxygen

GWT 2.7.0

GWT Eclipse Plugin: Version 3.0

Any idea what could be wrong? Thank you in advance.

Pilot Screen clip

Dev Screen clip