.cp-site-alert .alert.alert-success {
   background-image: linear-gradient(
    45deg, 
    yellow,
    Yellow 10%,
    black 10%,
    black 20%,
    Yellow 20%,
    Yellow 30%,
    black 30%,
    black 40%,
    Yellow 40%,
    Yellow 50%,
    black 50%,
    black 60%,
    Yellow 60%,
    Yellow 70%,
    black 70%,
    black 80%,
    Yellow 80%,
    Yellow 90%,
    black 90%,
    black 100%);
  background-size: 100% 6px;
  background-position: 50% 100%;
  background-repeat: no-repeat;
  
  color:black;
}