styles.css

.spinner-container {
  position: relative;
  box-sizing: border-box;
  padding: 15px;
  text-align: center;
  display: flex;
  justify-content: center;
}
.spinner {
  color: #fff;
  margin-top: 18px;
}
.spinner-xs {
  margin-top: 4px;
}
.flex-center {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}