.header {
    color: rgb(137, 202, 137);
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    text-align: center;
    font-size: 400%;
}

.subheader {
    color: rgb(147, 225, 247);
    text-align: center;
    font-size: 200%;
}

.announcement {
    overflow: hidden;
}

.sliding-background {
    background: url("https://upload.wikimedia.org/wikipedia/commons/2/20/Flag_of_the_Netherlands.svg") repeat-y;
    height: 1000px;
    animation: slide 1s linear infinite;
}

@keyframes slide {
    0% {
      transform: translate3d(0, 0, 0);
    }
    100% {
      transform: translate3d(0, -100px, 0);
    }
  }