* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  font-family: "Ubuntu", sans-serif;
  overflow: hidden;
}

a {
  text-decoration: none;
}

h3 {
  color: #fff;
  font-size: 18px;
  font-weight: 500;
  margin: 0;
  padding: 4px 8px;
  text-align: center;
}

#background {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: salmon;
  background: linear-gradient(-238deg, #fff, #fd8800, #fd008f, #9700fd, #3c60d2, #05c7e6, #4bd58d, #fff);
  background-size: 1200% 1200%;
  animation: rainbow 120s ease infinite;
}

#root {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

@keyframes rainbow {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}