<svg width='100%' height='65px'>
  <g>
    <rect fill='#3d5599' width='100%' height='25'></rect>
    <rect fill='#cb4d3e' width='45%' height='25'></rect>
  </g>
</svg>

html, body {
  height: 100%;
}

body {
  display: flex;
  background-color: #fff;
  align-items: center;
  justify-content: center;
  font-family: "Helvetica";
}

@keyframes move {
  0%, 100% {
    transform: translateX(0);
  } 50% {
    transform: translateY(35px);
  }
}

svg {
  g rect:first-of-type {
    animation: move 3s ease infinite;
  }
}