:root {
  --font-size: 16px;
  --font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body,
html {
  background-color: #e1e1e1;
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

p {
  font-size: calc(var(--font-size) * 1.2);
  margin: 0;
  padding: 0;
}

span::before,
span::after {
  content: "";
  position: absolute;
  top: -40px;
  left: -40px;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: transparent;
  border-color: transparent;
  border-style: solid;
  border-width: 2px;
  box-sizing: border-box;
}

span::before {
  animation: circle-wave-1 1.5s infinite;
}

span::after {
  animation: circle-wave-2 1.5s infinite;
}
span {
  position: relative;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #333;
  animation: wave 1.5s infinite;
  margin-bottom: 100px;
}

@keyframes wave {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes circle-wave-1 {
  0% {
    transform: scale(0);
    border-color: #838383;
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
    border-color: transparent;
  }
}

@keyframes circle-wave-2 {
  0% {
    transform: scale(0);
    border-color: #838383;
  }
  50% {
    transform: scale(1);
  }
  100% {
    transform: scale(0, 8);
    border-color: transparent;
  }
}