add ok message style
add ok message style

based on https://github.com/codenvy/cloud-ide/commit/8710987748efc803c9b3ffad6da78242bdfa6f85

R-Brain/codenvy,R-Brain/codenvy,codenvy/codenvy,codenvy/codenvy,R-Brain/codenvy,R-Brain/codenvy,R-Brain/codenvy,codenvy/codenvy,codenvy/codenvy,codenvy/codenvy,R-Brain/codenvy,codenvy/codenvy