* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: grid;
  place-items: center;
  background-color: #25335b;
}

.container {
  border: 10px solid #ffd700;
  border-radius: 20px;
  position: relative;
}

.container h1 {
  font-weight: 800;
  font-size: 40px;
  line-height: 1.1;
  font-family: "Arial Black", sans-serif;
  text-align: center;
  background-color: #f0f0f0;
  border: 1px solid #bbb;
  border-radius: 10px;
  padding: 0 50px 10px 50px;
}

.background {
  background: rgb(24, 60, 19);
}

.text {
  position: relative;
}

.invert {
  background: white;
  mix-blend-mode: difference;
}

.background,
.invert {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 50%;
  border-radius: 10px 0 0 10px;
  animation: slide 3.5s ease-in-out infinite alternate;
}

@keyframes slide {
  from {
    right: 5%;
  }

  to {
    right: 95%;
  }
}