@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap");

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

html,
body {
  width: 100%;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "Poppins", sans-serif;
}

fieldset {
  position: absolute;
  width: 300px;
  height: 300px;
  border: 10px solid transparent;
  border-top-color: black;
}

legend {
  font-weight: bold;
  font-size: 24px;
  line-height: 10px;
  margin-left: 16px;
  padding: 0 12px;
  animation: move 3s infinite linear alternate;
}

fieldset:nth-of-type(2) {
  transform: rotate(90deg);
}
fieldset:nth-of-type(3) {
  transform: rotate(180deg);
}
fieldset:nth-of-type(3) > legend {
  transform: rotate(180deg);
}
fieldset:nth-of-type(4) {
  transform: rotate(-90deg);
}

@keyframes move {
  100% {
    margin-left: 70px;
  }
}