message: feat(Circle): improve text padding
diff: position: absolute;
  top: 50%;
  left: 0;
  + box-sizing: border-box;
  width: 100%;
  + padding: 0 @padding-base;
  color: @circle-text-color;
  font-weight: @circle-text-font-weight;
  font-size: @circle-text-font-size;
  