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

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

.container {
  background-color: #282828;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  position: relative;
}

span {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.blue {
  background-color: #2892f9;
  width: 150px;
  height: 150px;
}

.red {
  background-color: #fb2f27;
  width: 100px;
  height: 100px;
}

.yellow {
  background-color: #fdfe29;
  width: 50px;
  height: 50px;
}