<div class="cont">
  <div class="spinner"></div>
  <span class="number"></span>
</div>


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

body {
  background-color: #777;
  height: 100vh;
  background-image:
    linear-gradient(black, transparent 10%, transparent calc(50% - 1px), #aaa calc(50% - 1px), #aaa calc(50% + 1px), transparent calc(50% + 1px), transparent 90%, black),
    linear-gradient(90deg, black, transparent 10%, transparent calc(50% - 1px), #aaa calc(50% - 1px), #aaa calc(50% + 1px), transparent calc(50% + 1px), transparent 90%, black);
}

.cont {
  width: 250px;
  height: 250px;
  position: fixed;
  text-align: center;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 2px solid #aaa;
  border-radius: 50%;
  overflow: hidden;
  
  &::after {
    content: '';
    width: 200px;
    height: 200px;
    position: absolute;
    top: 23px;
    left: 23px;
    border: 1px solid #aaa;
    border-radius: 50%;
    background: #777;
    background-image:
      linear-gradient(transparent calc(50% - 1px), #aaa calc(50% - 1px), #aaa calc(50% + 1px), transparent calc(50% + 1px)),
      linear-gradient(90deg, transparent calc(50% - 1px), #aaa calc(50% - 1px), #aaa calc(50% + 1px), transparent calc(50% + 1px));

  }  
}

.spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 125px;
  height: 100px;
  transform-origin: 0 0;
  background-image: linear-gradient(black, transparent);
  animation: spin 1s infinite linear;
  
  @keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
  }
}

.number {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  transform: translate(-50%, -50%);
  width: 250px;
  height: 250px;
  
  &::after {
    content: '';
    width: 250px;
    height: 250px;
    position: absolute;
    top: 0;
    left: 0;
    font-size: 150px;
    line-height: 250px;
    animation: count 10s infinite steps(10, start);

    @keyframes count {
      0%, 100% { content: '0'; }
      10% { content: '9'; }
      20% { content: '8'; }
      30% { content: '7'; }
      40% { content: '6'; }
      50% { content: '5'; }
      60% { content: '4'; }
      70% { content: '3'; }
      80% { content: '2'; }
      90% { content: '1'; }
    }
  }
}